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goldwombat802Lv1

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The evolution of the jaw provided vertebrates with a new and more effective method of feeding. How did the vertebrate jaw develop through modification of pre-existing structures? What changes in gene expression and developmental pathways were necessary? What does the field of evo-devo tell us?

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8 Jan 2022

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Question: From the Article Below, write a review of the current status of development of antibiotics." I do not have the figures!"

Article: Antibiotic discovery in the twenty-first century: current trends and future perspectives

New antibiotics are necessary to treat microbial pathogens that are becoming increasingly resistant to available treatment.

Despite the medical need, the number of newly approved drugs continues to decline. We offer an overview of the pipeline for

new antibiotics at different stages, from compounds in clinical development to newly discovered chemical classes. Consistent

with historical data, the majority of antibiotics under clinical development are natural products or derivatives thereof. However,

many of them also represent improved variants of marketed compounds, with the consequent risk of being only partially

effective against the prevailing resistance mechanisms. In the discovery arena, instead, compounds with promising activities

have been obtained from microbial sources and from chemical modification of antibiotic classes other than those in clinical use.

Furthermore, new natural product scaffolds have also been discovered by ingenious screening programs. After providing selected

examples, we offer our view on the future of antibiotic discovery.

The Journal of Antibiotics advance online publication, 16 June 2010; doi:10.1038/ja.2010.62

Keywords: antibiotics; natural products; pipeline

Medical progress in the prevention and treatment of many diseases,

which have resulted in significantly increasing life expectancy, may be

put at risk without the introduction into clinical practice of new

antibiotics effective against multidrug-resistant (MDR) pathogens.

Although most stakeholders agree that new antibiotics could tackle

this unmet medical need, opinions vary on how new antibiotics could

be discovered and brought into the market in a cost-effective manner.

1â3 Two considerations would probably meet with unanimous

consensus: the golden era of antibiotic discovery is gone and it will not

be repeated; and genomics, combinatorial chemistry and highthroughput

screening do not represent the magic bullet to fill the

pipeline with new developmental drug candidates. In this respect, it is

important to underline the contribution that natural products,

especially those of microbial origin, can provide to antibiotic discovery,

as advocated by Demain4,5 on several occasions. The decreasing

number of drugs approved for clinical use, year after year, suggests

that the âailing pharmaceutical industryâ is not yet following the

âprescriptionâ of Demain,6 as spelled out in 2002.

The purpose of this review is to highlight some of todayâs features of

antibiotic discovery in the context of the current medical needs and

the existing pipeline of antibacterial agents in clinical development.

Our main focus will be on chemical classes that, if developed into

drugs, would be new to the clinic. However, these classes would not

necessarily be new to science. For example, a âlook-backâ strategy was

applied to antibiotics discovered during the golden era, which were

then reexamined using contemporary tools in the light of current

medical needs.7 Although some important breakthroughs have also

been made in identifying new promising drug candidates from

synthetic origin, for reason of space, and in the spirit of the important

contributions to the field by Demain, we would limit ourselves

to antibiotics of microbial origin and their derivatives reported

since 2005.

CURRENT ANTIBIOTIC PIPELINE

Infections due to methicillin-resistant Staphylococcus aureus (MRSA),

vancomycin-resistant Enterococcus faecium (VRE) and fluoroquinolone-

resistant Pseudomonas aeruginosa are rapidly increasing in US

hospitals, and even more frightening is the recent occurrence of

panantibiotic-resistant infections, involving Acinetobacter species,

MDR P. aeruginosa and carbapenem-resistant Klebsiella species.8,9

Although antibiotic resistance continues to grow in hospitals and in

the community, involving both Gram-positive and Gram-negative

pathogens, the number of newly approved agents has been decreasing,

with only six new antibiotics approved since 2003.

In the late 90s, following the global concern regarding the rapid

increase in MRSA, many companies redirected their attention to target

Gram-positive pathogens, particularly MRSA, VRE and penicillinresistant

Streptococcus pneumoniae, as evidenced by the commercial

and clinical success of linezolid and daptomycin, the only antibiotics

belonging to new classes introduced in clinical practice since the early

1960s. However, most antibiotics currently under development for

Gram-positive infections are improved derivatives of existing drugs

(see Table 1). As vancomycin has been increasingly used for the

treatment of a wide range of infections, second-generation glycopep-

tides with improved profile over vancomycin were developed. Among

them, telavancin, a once-a-day derivative of vancomycin, was

approved by the US Food and Drug Administration (FDA) in 2009.

Oritavancin, derived from the vancomycin-related glycopeptide chloroeremomycin,

is highly active against VRE strains and shows a long

plasma half-life. However, in 2008, the FDA did not authorize its

commercialization. The long-acting glycopeptide dalbavancin, a derivative

of the teicoplanin-related glycopeptide A40926, was also not

approved by FDA, because of insufficient clinical evidence of efficacy.

If approved, dalbavancin would be the first antibiotic to be administered

once weekly.10

Resistance to methicillin in S. aureus is mediated by the production

of a penicillin-binding protein with reduced affinity for b-lactams. The

most recent cephalosporins, ceftobiprole and ceftaroline (Table 1),

have been specifically designed to enhance activity against MRSA and,

thanks to their oral availability, are particularly attractive for the

community setting. Ceftobiprole is quickly bactericidal against a wide

range of Gram-positive pathogens, including MRSA and VRE and has

been approved in Canada and Switzerland.11 However, early in 2010,

the FDA did not grant market authorization to ceftobiprole, and later

the European authority issued a negative opinion on this compound.

Ceftaroline, which is active against most Gram-positive pathogens

with the exclusion of enterococci, has completed phase III studies and

may be submitted for FDA approval.12 Both cephalosporins, however,

lose potency against MRSA compared with methicillin-susceptible

S. aureus strains. The injectable carbapenem PZ-601 has shown potent

activity against drug-resistant Gram-positive pathogens, including

MRSA, and is currently undergoing phase II studies.13

After the success of linezolid, many new oxazolidinones are being

developed for Gram-positive infections. Radezolid14 and torezolid15

are currently in phase II trials, whereas RWJ-416457 has completed the

phase I trial. Despite the fact that the use of fluoroquinolones has been

associated with increased incidence of MRSA,16 several new members

of this class are under development: delafloxacin, nemonoxacin,

zabofloxacin and WCK-771 (Table 1) are the most advanced.

The extensive use of fluoroquinolones and other wide-spectrum

antibiotics such as cephalosporins, by affecting the normal gut flora,

has led to the rapid diffusion of Clostridium difficile-associated

diarrhea, particularly in elderly and immunocompromised patients.

Difimicin, currently in phase III, and ramoplanin, with phase II

completed, are microbial products under development for prevention

and treatment of C. difficile-associated diarrhea, acting locally by

decolonizing the gut (Table 1).

Other compounds which have completed phase I clinical trials

include the oral and injectable pleuromutilin BC-3205,17 the FabI

inhibitor AFN-1252 targeting staphylococcal infections18 and the

lipopeptide friulimicin (Table 1).19

The scenario is even more disappointing for compounds targeting

Gram-negative pathogens, in which old drugs have been revamped for

new uses, and none of them has reached phase III yet (Table 1).

Ceftazidime is a marketed cephalosporin being developed in combination

with NXL104, a representative of a new class of b-lactamase

inhibitors,20 which renders cephalosporin effective against most

b-lactamase-producing enterobacteria. If approved, this combination

would be the first alternative to piperacillin/tazobactam. NXL104 is

also under investigation in combination with ceftaroline.21 CXA-101 is

a ceftazidime-like compound with improved stability against the

AmpC b-lactamase, but it shows no improvements against MDR

P. aeruginosa,22 unless administered in combination with tazobactam.

The new aminoglycoside ACHN-490, effective against pathogens

resistant to this class, has recently completed phase I.23 The new

monobactam BAL-30072, stable against metalloenzymes, is ready to

start clinical development against difficult-to-treat Gram negatives,

including Pseudomonas and Acinetobacter.24

The increasing spread of MDR Gram-negative pathogens, particularly

P. aeruginosa, Acinetobacter spp. and some Enterobacteriaceae has

renewed the interest toward narrow-spectrum compounds, to avoid

other clinical conditions associated with the use of broad-spectrum

antibiotics. However, because of a long history of success in the

empirical treatment of infections, many hospitals lack rapid and

effective tools for identifying etiological agents. This limitation poses

significant hurdles for the clinical development of narrow-spectrum

compounds.

APPROACHES LEADING TO NEW ANTIBIOTIC CLASSES

It is generally agreed that the best way to overcome the decreasing

efficacy of existing antibacterial agents is to introduce into practice

compounds belonging to classes that are new to the clinic. Microbial

sources can provide a rich reservoir of such compounds, and the

different approaches used usually aim at discovering either a novel

class or an improved variant of a poorly explored class. However,

this must be carried out in a high background of many known

compounds, some of which are encountered in random screening

programs at a relatively high frequency. Thus, the discovery of an

antibacterial agent belonging to a new chemical class or an improved

variant of an existing class is a rare event, and the approaches

described below reflect strategies designed and implemented to

capture this rare event. Appropriate strategies include retrieving

microbial strains from underexplored environments, screening new

microbial taxa, mining microbial genomes and using innovative

assays. These strategies have led to some novel chemical classes, as

illustrated in Figure 1.

As an example of the first strategy, investigation of deep-sea

sediment samples led to the discovery of abyssomicins (Figure 1),

which are polycyclic antibiotics from the new marine actinomycete

taxon Verrucosispora.25 The compounds were discovered using a simple

agar diffusion assay, which involved pursuing antibiotics the action of

which could be reverted upon addition of p-aminobenzoic acid.

Abyssomicins represent a new chemical class, and preliminary studies

indicate that they act as substrate mimics of chorismate. Interestingly,

only abyssomicin C and its atrop stereoisomer show antibiotic activity

against Gram-positive bacteria, including MDR S. aureus.26

An additional example of a new chemical class discovered by

screening new taxa is represented by thuggacins (Figure 1), which

are thiazole-containing macrolides produced by the myxobacteria

Sorangium cellulosum and Chondromyces crocatus.27 These compounds

show activity against Mycobacterium tuberculosis and their target

appears to be the electron transport chain.

Another successful approach has been exploring microbial genomes

for the presence of secondary metabolite pathways. As the corresponding

genes are organized in clusters and bioinformatic tools allow

a reasonable prediction of the pathway product, this bioactivityindependent

approach can directly target structural novelty. On a

pioneering work of this type, scientists at Ecopia Biosciences (now

Thallion Pharmaceuticals, Montreal, QC, Canada) identified ECO-

02301, a linear polyene from Streptomyces aizunensis with antifungal

activity28 and ECO-0501, a glycosidic polyketide from Amycolatopsis

orientalis with activity against Gram-positive pathogens, including

MDR isolates (Figure 1).29 In a similar approach, a novel cyclic

lipopeptide, designated orfamide (Figure 1), was identified from the

Pseudomonas fluorescens genome.30 In this case, the bioinformatic

prediction that the peptide contained four leucine residues suggested

feeding with 15N-Leu, which facilitated compound purification and

characterization. Orfamide shows a moderate antifungal activity

against amphotericin-resistant strains of Candida albicans and may

prove beneficial in agriculture and crop protection.

Another important strategy for discovering new classes of antibiotics

has been the implementation of increased-sensitivity assays in

screening programs. One such approach relied on the antisense

technology. When the level of a desired bacterial target is depleted

by overexpression of the cognate antisense mRNA, the strain becomes

hypersensitive to compounds acting on that target. By using a target

against which few compounds are known to act, the increased

sensitivity of the assay should allow the identification of compounds

routinely missed with growth inhibition assays on the wild-type

strain.31 One assay involved the FabH/FabF enzyme, required for

fatty acid biosynthesis in bacteria. Antimicrobial activities were

detected by agar diffusion in a two-plate assay, in which one plate

was inoculated with S. aureus carrying the antisense construct and the

other plate with an S. aureus control. Different inhibition halos in the

two plates indicated an increased sensitivity of the âantisense strain.â

After screening 4250 000 microbial product extracts, the assay led to

the identification of a new chemical class that includes platensimycin

(Figure 1), produced by Streptomyces platensis, and related compounds.

Platensimycin shows antibacterial activity against Grampositive

pathogens, including MDR strains, and was also effective in

an experimental model of infection.32

In another increased-sensitivity assay, a high-throughput screening

program was implemented to identify inhibitors of a cell-free translational

system affecting steps other than elongation. The assay made

use of a model âuniversalâ mRNA that could be translated with similar

efficiency by cell-free extracts from bacterial, yeast or mammalian cells.

The rationale behind the approach was to use a sensitive assay and to

discard frequently encountered compounds using a polyU-based assay.

This program led to the identification of GE81112 (Figure 1), a novel

tetrapeptide produced by a Streptomyces sp., which targets specifically

the 30S ribosomal subunit by interfering with fMet-tRNA binding to

the P-site.33 The compound was highly effective against a few Grampositive

and Gram-negative strains, if grown in minimal or chemically

defined medium, suggesting active uptake by the cells.34

The above examples illustrate how different approaches can lead to

novel antibiotic classes. Usually, when unexploited microbial diversity

is accessed, there is no need for specific, high-sensitivity assays.

Whichever the approach chosen, there is no guarantee of success.

The reader is referred to a recent review for suggestions on how to

increase the probabilities of success.35

IMPROVED VARIANTS FROM MICROBIAL SOURCES

New variants of known classes can be found by screening microbial

strains, by varying cultivation procedures or by manipulating the

biosynthetic pathway. There is an increasing amount of literature

related to pathway manipulation and this trend is likely to continue as

methodological advancements result in increased success rates. In

some cases, the desired variant might not be a more active compound,

but a molecule carrying functional groups suitable for further chemical

modifications. As the antibiotics in clinical use belong to a few

classes, which have been extensively explored by screening and

chemical modification, there is probably little space for finding

improved variants within those classes. We provide selected examples

of microbial strains producing improved variants of chemical classes

not yet in clinical use.

Lantibiotics, which are ribosomally synthesized peptides that

undergo posttranslational modifications to yield the active structures

containing the typical thioether-linked (methyl)lanthionines, are produced

mostly from strains belonging to the Firmicutes and, to a lesser

extent, to the Actinobacteria. Their antimicrobial activity is limited to

Gram-positive bacteria. The prototype molecule is nisin, discovered in

the 1920s and used as a food preservative for440 years.36 Lantibiotics

with antibacterial activity are divided into two classes according to

their biogenesis: lanthionine formation in class I compounds requires

two separate enzymes, a dehydratase and a cyclase, whereas a single

enzyme carries both activities for class II lantibiotics. Until recently,

the occurrence of class I compounds was limited to the Firmicutes (see

below). Although compounds from both classes exert their antimicrobial

activity by binding to Lipid II, they do so by binding to

different portions of this key peptidoglycan intermediate.

As lantibiotics bind Lipid II at a site different from that affected by

vancomycin and related glycopeptides, they are active against MDR

Gram-positive pathogens and have attracted attention as potential

drug candidates. The compound NVB302, a derivative of deoxyactagardine

B (Figure 2a) produced by a strain of Actinoplanes liguriae, is

currently a developmental candidate for the treatment of C. difficileassociated

diarrhea.37 Independently, a screening program, designed to

detect cell-wall-inhibiting compounds turned out to be very effective

in identifying lantibiotics from actinomycetes.38 It consisted of identifying

extracts active against S. aureus but inactive against isogenic

L-forms, discarding extracts the activity of which was abolished by

b-lactamases or by excess N-caproyl-D-alanyl-D-alanine. Among the

new lantibiotics identified, the most active compound was NAI-107

(Figure 2a), produced by Microbispora sp.39 This compound represents

the first example of a class I lantibiotic produced by actinomycetes. It

is currently a developmental candidate for the treatment of nosocomial

infections by Gram-positive pathogens.40 The same screening

program led to the identification of additional class I lantibiotics from

actinomycetes. Among them, the compound 97518 (Figure 2a),

structurally related to NAI-107,41 afforded improved derivatives by

chemical modification.42 Another interesting advancement in the

lantibiotic field has been the discovery of two-component lantibiotics

produced by members of the class Bacilli. The best characterized

compound is haloduracin43,44 (Figure 2a), whereas lichenicidin has

been proposed from genomic studies but has not yet confirmed by

structural elucidation.45 Although their antimicrobial activities have

not been described in detail, recent work suggests similar activities for

haloduracin and nisin.44

Thiazolylpeptides are highly modified, ribosomally synthesized

peptides that inhibit bacterial protein synthesis by affecting either

one of two targets: elongation factor Tu, as for GE2270 and related

compounds; or the loops defined by 23S rRNA and the L11 protein,

exemplified by thiostrepton. Most thiazolylpeptides show potent

activity against Gram-positive pathogens, yet their poor solubility

has limited clinical progress, and only a derivative of GE2270 has

entered clinical trials for the topical treatment of acne.46 Novel

members of this class have been described (Figure 2b): thiomuracins47

belong to the subgroup targeting EF-Tu, with an antibacterial profile

similar to GE2270; thiazomycin48 and philipimycin,49 which target the

50S subunit, show high activity against Gram-positive strains, and a

similar profile to thiostrepton.

For ribosomally synthesized peptides, such as lantibiotics and

thiopeptides, new representatives can be generated by site-directed

mutagenesis of the corresponding structural genes. Libraries of new

molecules have been obtained, many of which, as in the examples of

actagardine50 and thiocillin,51 retained antibiotic activities comparable

with those of the parent molecule.

CHEMICAL DERIVATIVES

Many papers have been published in the past 5 years reporting

chemical programs aimed at overcoming the prevailing resistance

mechanisms and/or to improve the drug profile of known microbial

products. Novel approaches included the use of new tools, such as

click chemistry and total synthesis. For the classical approach of semisynthesis,

we will limit the examples to selected compounds not yet in

clinical use.

Click chemistry is a new synthetic approach that can accelerate drug

discovery by using a few practical and reliable reactions. A âclickâ

reaction must be of wide scope, giving consistently high yields with

various starting materials; it must be easy to perform, insensitive to

oxygen or water and use only readily available reagents; finally,

reaction work-up and product isolation must be simple, without

chromatographic purification.52 As an example, this approach was

used to produce new lipophilic teicoplanin and ristocetin aglycons

with improved activity against Gram-positive bacteria, including

VRE.53 For aminoglycosides, which usually require multiple protectionâ

deprotection steps to selectively manipulate the desired amino

and hydroxyl groups, click chemistry allowed the transformation

of neomycin B into several novel building blocks that were used for

the specific modification of the ring systems, thus generating new

neomycin analogs the biological activity of which is currently under

investigation.54

For some low-molecular-weight compounds, total synthesis has

become available and will be useful to design preliminary SAR for new

classes of antibiotics (such as platensimycin) or to access new

derivatives for already known classes (such as tetracyclines). Indeed,

the novel scaffold and intriguing biological property of platensimycin

captured the interest of several research groups, which reported

different elegant total syntheses.55 In addition, medicinal chemistry

studies have been conducted, and the design, synthesis and biological

evaluation of several platensimycin analogs incorporating varying

degrees of molecular complexity have been reported.56â58 Preliminary

data indicate that certain modifications of the intricate cage region can

be made without detrimental effects on potency, whereas even small

modifications of the benzoic acid region result in a drastic loss of

activity (Figure 1). Another remarkable chemical improvement in the

synthesis of natural product analogs was a short and enantioselective

synthetic route to a diverse range of 6-deoxytetracycline antibiotics

(Figure 3a). This new approach targeted not a single compound but a

group of structures with the D ring as a site of structural variability.

A late-stage, diastereoselective C-ring construction was used to couple

structurally varied D-ring precursors with an AB precursor containing

much of the essential functionality for binding to the bacterial

ribosome. Results of antibacterial assays and preliminary data

obtained from a murine septicemia model show that many of the

novel tetracyclines synthesized have potent antibiotic activities. This

synthetic platform gives access to a broad range of tetracyclines that

would be inaccessible by semi-synthesis and provides a powerful

engine for the discovery of new tetracyclines.59,60

Even on larger molecules, semi-synthetic and synthetic chemistry

has been successfully applied to study and optimize lead compounds.

The lipoglycodepsipeptide ramoplanin (Figure 3b) is 2â10 times more

active than vancomycin against Gram-positive bacteria and maintains

full activity against VRE and all MRSA strains. However, its systemic

use has been prevented by its low tolerability at the injection site,

apparently related to the length of the fatty acid side chain.

To overcome this problem, the fatty acid side chain was selectively

removed and replaced with different carboxylic acids. Many derivatives

showed an antimicrobial activity similar to that of the precursor,

and a significantly improved local tolerability.61 The recently

described, fully synthetic lactam analog of ramoplanin showed the

same biological activity as the natural product. Moreover, a set of

alanine analogs, obtained by total synthesis, has provided insights into

the importance of individual amino-acid residues on ramoplanin

activity. The MICs of each alanine-containing analog parallels its

ability to bind Lipid II. Apart from positions 5, 6 and 9, which can

tolerate alanine substitutions, MICs increased 415-fold upon alanine

replacement, with dramatic effects observed for positions 4, 8, 10 and

12. The new data thus confirm the importance of the ornithine

residues at positions 4 and 10, with the latter directly involved in

target binding, most likely by ion pairing with the diphosphate of

Lipid II.62,63

The mannopeptimycins, which were originally isolated in the late

1950s from Streptomyces hygroscopicus, have been recently revived

because of their promising activity against clinically important Grampositive

pathogens, including S. pneumoniae, MRSA and VRE. They

also bind to Lipid II, but in a manner different from ramoplanin,

mersacidin and vancomycin. Multiple approaches have been used to

optimize the mannopeptimycin activity profile, including selective

chemical derivatization, precursor-directed biosynthesis and pathway

engineering. The SAR data have shown that substitution of a hydrophobic

ester group on the N-linked mannose or serine moieties

suppressed antibacterial activity, whereas hydrophobic acylation on

either of the two O-mannoses, particularly the terminal mannose,

significantly enhanced activity. AC98-6446 (Figure 3b) represents an

optimized lead obtained by adamantyl ketalization of a cyclohexyl

analog prepared by cyclohexylalanine-directed biosynthesis. AC98-

6446 showed superior antimicrobial potency and properties, both

in vitro and in vivo.7,64

Laspartomycin is active against VRE and MRSA strains. Recently,

enzymatic cleavage of its lipophilic moiety allowed the synthesis of

various acylated derivatives (Figure 3b), even if none was more potent

than the parent antibiotic.65 The cyclic heptapeptide GE23077 is a

potent and selective inhibitor of bacterial RNA polymerase

that, probably because of its hydrophilicity, is unable to cross

bacterial membranes. New derivatives obtained by modifying different

moieties were reported. Although many of them retained activity

on the enzyme, none showed a significant antibacterial activity

apart from marginal inhibition of Moraxella catarrhalis growth

(Figure 3b).66

FUTURE PERSPECTIVES

This brief and nonexhaustive excursus on the present and future

pipeline of antibacterial agents for treating human diseases provides

opportunities for additional considerations. The first is that, of the

antibiotics under clinical development (Table 1), 67% are natural

products themselves, or natural product-derived compounds, a percentage

perfectly in line with that found with exisiting drugs.67

The second consideration is that the major players in antibacterial

development are small companies, which are not deterred by the small

market size for these drugs. However, it should be noted that a

significant number of the compounds listed in Table 1 were not

discovered by small companies, but actually represent projects abandoned

by large pharmaceuticals companies. Thus, it remains to be

seen whether small biotechs will dedicate sufficient resources and be

successful in discovering and developing novel antibacterial agents.

In this relatively grim scenario, microbial products continue to

provide new chemical classes or unexpectedly active variants of

chemical classes already known to science. New technologies can

now provide access to unexplored microbial diversity or to hypersensitive

assays to detect bioactive compounds. Furthermore, the information

derived from rapidly accessing the genome of many microbial

strains can provide new routes to natural product discovery, as well as

making more effective traditional, bioassay-based screening efforts.

In our opinion, no single technology will represent the magic bullet

for antibiotic discovery, but only the painstaking integration of a

multidiscplinary team with profound knowledge of microbiology,

chemistry and bioinformatics will ultimately lead to new antibacterial

agents of medical relevance and commercial success.

mauvemammoth698

As temperatures in an African savanna increase and rainfall decreases, it would most likely change into

tiaga

desert

tropical rainforest

temperate forest

What is imprinting? Give an example.

fixed assocation, such as hatching ducks recognizing the first animal they see as their mother

a learned behavior, such as a wasp circling during a search for food, so that it can return to its nest

alteration of instinct, such as a spider changing the type of web it weaves depending upon the environment

Opportunistic species

provide extensive care for their offspring

produce many offspring

reproduce later in life

What are the five agents of microevolution?

gamete production; mating; fertilization; caring for offspring; formation of herds

photosynthesis; respiration; mitosis; meiosis; fertilization

mutation; gene flow; nonrandom mating; genetic drift; natural selection

Microevolution is

new species

minor extinction of species

changes in allele frequency in a population

Which of the following is does not help defend against predators?

Toxins made by plants that injure caterpillars feeding on the plant

The large eyespots on a moth's wing that can startle a hungry bird

Thorns on a plant

Many plants have brightly colored fruit and flowers

Humans have a favored birth weight, neither too small nor too large. This is

stabilizing selection

disruptive selection

artificial selection

directional selection

What is a keystone species?

the first organism that populates an area

an organism upon which the entire ecosystem depends

the first fossils found in the earliest rock strata

As temperatures in the Arctic warm, which of the following changes may occur?

Tundra will be replaced by taiga

Taiga will be replaced by tundra

Temperate forest will be replaced by taiga

Tundra will be replaced by desert

Taiga will be replaced by temperate rain forest

What is desertification?

restoration of vegetation and water to deserts

areas adjacent to deserts also become deserts

abandonment of a habitat by animals

Evolution occurs at the level of

individuals

populations

communities

The maximum population that the environment can support is called the

biotic potential

environmental resistance

carrying capacity

replacement reproduction

demographic transition

A population with relatively more pre-reproductive individuals is common in _____-developed countries

less

Endangered species sometimes breed in captivity. Why are such species endangered in the wild?

Their population density is too high

Loss of habitat

Their environment is polluted

Abiotic components of an ecosystem include

only animal life

only plant life

living components only

nonliving components only

both living and nonliving components

Carbon returns to the atmosphere

as carbon dioxide

from respiration of plants

by the burning of fossil fuels

from respiration of animals

All of the answer choices are correct

Why does the Tropical Rain Forest contain an abundance of antibiotic compounds?

The area is crowded, leading to random production of useful compounds

The area is wet. plants had to develop resistance to fungi and bacterial infections

There is a great diversity of plants, leading to random production of useful compounds

The carrying capacity of the environment for a species is determined by

the reproductive rate of the organism

the number of organisms of that species

the state and national wildlife laws pertaining to that species

a complex

the limited productivity of the environment and the environmental resistance to the biotic potential of the organism

An introduced species that breeds and spreads is

resourceful

harmful

native

dominant

invasive

What is disruptive selection?

environmental influences that select against change

environmental influences that promote one phenotype versus all others

environmental influences that promote two or more phenotypes versus all others

Natural selection acts on

individuals

populations

communities

Two populations of birds live in the same area but have different sleep/wake cycles. This is

behavorial isolation

mechanical isolation

geographical isolation

temporal isolation

An insect that resembles the face of a snake avoids predation by

camouflage

warning coloration

mimicry

chemical defense

mutualism

Unselfish acts that help others in a group so that they increase their chances of surviving and reproducing is called

imprinting

mimicry

altruism

learning

instinct

If an environment changes rapidly, organisms with ____ will be more likely to survive and reproduce.

the correct allele frequency

existing neutral mutations

existing beneficial mutations

How did geology influence Darwinâs thoughts?

It demonstrated that the earth was very old, therefore there was enough time for species to evolve

it demonstrated that all continents were similar

it demonstrated the presence of many fossils

The founder effect occurs when

large groups of individuals leave their home population and establish new settlements, mating only among themselves

many members of a population die, resulting in a great loss of genetic diversity

many members of a population reproduce causing too much genetic diversity within the population

small groups of individuals leave their home population and establish new settlements, mating only among themselves.

The greenhouse effect is due to high atmospheric

Nitrogen

Ammonia

Carbon monoxide

Carbon dioxide

Oxygen

What are the Reproductive Barriers that keep species separate?

lack of food; lack of habitat; lack of potential mates; lack of nesting sites; lack of genetic variation

mountains; canyons; glaciers; bodies of water (for terrestrial animals); areas of land (for aquatic animals)

habitat isolation; temporal isolation; behavioral isolation; mechanical isolation; gamete isolation

What is directional selection?

environmental influences that select against change

environmental influences that promote one phenotype versus all others

environmental influences that promote two or more phenotypes versus all others

Which of the following is correct when describing a predator-prey cycle?

A decline in the numbers of predators causes a decline in the number of prey

A decline in the numbers of prey causes a decline in the number of predators

An increase in the number of predators triggers an increase in the number of prey

An up-and-down cycle will be seen for the prey animal

A seasonal die-off that will occur without the other species present

Why are top-level predators (lions, eagles, humans) so rare in a community?

Only a small amount of the energy is passed from one trophic level to the next

They do not breed as fast as other animals

Because of predation by higher predators

It is difficult for them to learn how to capture prey

Their job is to keep the population size of other animals in check

Alleles conferring bright color to male guppies are common because

they make males less visible to predators

they help males identify each other

they are preferred by females

Organisms that obtain their energy from producers or other consumers are

autotroph

heterotroph

producer

autotroph and producer

heterotroph and producer

What is the environmental impact of strip mining?

lack of trees exposes the surface of the earth, promoting runoff and loss of adjacent trees

removal of minerals from the soil hampers growth of vegetation

it causes a potential increase in volcanic activity

Two populations of squirrels are separated by a mountain range and would not be capable of interbreeding. This is an example of:

behavorial isolation

mechanical isolation

geographical isolation

temporal isolation

What is a danger of overfishing?

humans will become dependent upon fish

selection for smarter fish that can avoid being caught

driving the population back into the lag phase

What is meant by prezygotic versus postzygotic speciation mechanisms?

before versus after formation of a zygote

before versus after meiosis

before versus after gamete formation

The relatively short term changes in allele frequencies within a species or population is

artificial selection

microevolution.

speciation

macroevolution

Avoidance of a location with predators is the result of

imprinting

mimicry

altruism

learning

instinct

What is the difference between Density-Dependent and Density-Independent Factors on populations?

density-dependent factors exert a greater influence when there are more individuals; density-independent exerts the same influence on all individuals regardless of their number

density-dependent factors exert a greater influence on larger, more dense individuals; density-independent factors exert the same impact on individuals of all size

density-dependent factors exert the same influence on all individuals regardless of their number; density-independent factors exert a greater influence when there are more individuals regardless of their number

All of the organisms in a given location or area is termed a

peer group

flock

community

population

herd

The concentration of the pesticide DDT would be highest in

a minnow

a mosquito larva

a seagull

plankton

algae

Our biosphere is

the Earth

the atmosphere

the ocean

land on Earth

fresh and salt water

What is meant by âcarrying capacityâ?

the amount of food produced in an ecosystem

the extent of energy required to maintain an ecosystem

the number of individuals that can be supported by an ecosystem

Species living on another is

resource partitioning

coevolution

symbiosis

predation

niche sharing

One species feeding on another is

competition

a community

an ecosystem

predation

symbiosis

Populations of different species interacting with one another in a natural environment is called

competition

a community

a biome

predation

symbiosis

Which of the following is not a biogeochemical cycle?

ATP cycle

water cycle

carbon cycle

phosphorus cycle

nitrogen cycle

Horses became larger and faster to escape predators. This is

stabilizing selection

disruptive selection

artificial selection

directional selection

Norman Borlaug won the 1970 Nobel Peace Prize for:

His discovery that plant secondary metabolites play a role in defending plants from insects and diseases.

Creating the FlavrSavr tomato.

His discovery of the area of origin for maize.

His work to create improved, high yield crop varieties that helped to prevent starvation.

Producing the first transgenic plant.

Which of the following best demonstrates evolution?

Your pet walks to the door when it hears your car in the driveway.

A crop has a higher yield after fertilizer is added.

Over time, a gene for disease resistance becomes more frequent in a population of plants.

A giraffe with a longer neck survives a drought year, while one with a shorter neck does not.

A houseplant is moved to a sunnier location and it starts to grow more vigorously.

What is the difference between genetically-modified and transgenic crops?

Genetically-modified crops are produced using modern techniques, while transgenic crops are produced through classical breeding.

Transgenic crops are illegal, while genetically-modified crops are not.

Genetically-modified crops are a type of transgenic crop specifically bred for high yield.

Transgenic crops are a type of genetically-modified crops, in which scientists have inserted genes from another species.

They are the same.

The repeated domestication of grasses (i.e., cereals) and legumes across the globe is likely because:

Human populations were often starving, and needed an additional food source

Only grasses, not legumes, were repeatedly domesticated

Early technologies allowed early agriculturalists the ability to communicate with each other over long distances to discuss what plants were best for domestication.

Both already possessed all of the traits needed for domestication

Both contain almost all of the amino acids our bodies need to build proteins.

What is one type of information that can be gathered by archeologists who are studying dental caries (cavities) of ancient populations?

The time of year the person died

How many children the person had

The type of plants they may have been consuming

The types of tools used for planting/harvesting grains

How many conflicts they have been part of

Which of the following types of agriculture can be practiced in an urban setting?

Vertical farms

CSA farms

Alternative farms (crickets, caterpillars, other arthropods)

All of these types of agriculture can be practiced in an urban setting

Community gardens

In discussing the origin of agriculture, the term demographic stress refers to:

That the stresses on pre-domesticated plant species led to the development of traits that result in the "domestication syndromeâ

Lower productivity of un-cultivated plants due to late-Pleistocene cooling.

Hobbes's assertion that hunter-gatherer groups did not posses the knowledge or skills to develop agriculture.

The situation where human populations are greater than the carrying capacity of the environment.

A higher incidence of religious practice in societies following the transition from hunting and gathering to agriculture.

In what way did Harlanâs theory give rise to Diamondâs theory?

It recognized that agricultural societies were healthier and better fed than hunter-gatherer societies.

It recognized agriculture might have developed by different mechanisms in different parts of the world.

It recognized the reason agriculture did not develop in certain parts of the world was because people lacked the intelligence or skill.

Both make the assumption that hunter-gatherers were (and still are) superior to agriculturists.

It is a basic case of scientific plagiarism - Diamonds theory is identical to Harlans theory.

Plant species that rely on _______ pollination produce much more pollen than those using other methods.

Brussel sprouts, cabbage, broccoli and cauliflower are all different varieties of the same species, Brassica oleracea. This group of plants demonstrates that crop breeding can lead to:

Low within variety and high between variety diversity

High between variety diversity

Low within variety diversity

High within variety and high between variety diversity

High within variety and low between variety diversity

If a plant can grow well all by itself in the wild, yet still retains desirable agronomic traits, the plant is ____________________.

Choose the single best answer

The inability of plants to move makes it difficult for them to:

Create oxygen.

Disperse seeds.

Defend themselves.

Disperse seeds and defend themselves.

Disperse seeds, defend themselves, and create oxygen.

Vavilov hypothesized that in a crop plant's area of origin we should expect:

Greater diversity for trans-domesticated species, but lower diversity for species domesticated in their area of origin.

Lower genetic diversity than in areas outside of the plant's area of origin.

Lower diversity for trans-domesticated species, but greater diversity for species domesticated in their area of origin.

Greater herbivore damage because of increased genetic diversity.

Greater genetic diversity than in areas outside of the plant's area of origin.

______________________ compounds are produced by plants, but are not necessary for the plant's immediate survival. However, they often help protect plants from being eaten.

What is the difference between classically bred varieties and landraces?

Landraces cannot be harvested using domesticated animals; classically bred crops can be harvested using domesticated animals.

Landraces have no means of seed dispersal; classically bred crops can readily disperse their seeds

Landraces are grown in dry conditions; classically bred crops are wetland species

Landraces are often (though not always) developed by unintentional processes; classically bred crops are developed by intentionally breeding for desired traits using modern techniques

Landraces are not edible by humans; classical bred crops can be eaten