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raspberryguinea-pig531Lv1

28 Sep 2019

1. Endosymbiosis envolved just once in the history of life. (True or False)

2. Symbiosis is when two organisms cooperate. Endosymbiosis is when one organsism cooperates from inside another organism host (True or False)

3. Complex cells - eukaryotes - are at least 2 Ga. (True or False)

4. Which of the following traits does not define eukaryotes? A. Have sex, B. Have about 1000 times the DNA of a prokaryote, C. DNA is housed within a membrane bound structure called the nucleus, D. Are usually half the volume of a prokaryote, E. Have organelles

5. Stromatolites are a type of: A Body fossil, B. Chemical Biomaker C. Trace fossil

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Jean KeelingLv2

28 Sep 2019

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1.) the oldest fossil identifie so far , the stromatolites , represent which type of cell ?

2. A genetic change that causes a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped make possible the evolution of a tetrapods limb. This type of change represents which of the following ?

A. Paedomorphosis

B. Heterochrony

C. A change in developmental gene or in its regulation that altered the spatial organization of body parts

D. The influence of environment on development

3. The endosymbiosis theory states the orgin of the eukaryotic cells began when

A. A mutation in prokaryotic cells led to the creation of new organelles

B. Prokaryotic cell consumed a smaller cell

C. Prokaryotic cells went extinct

D. A prokaryotic cell needed more energy and evolved a mitochondria

4. Long term trends over geological history in speciation and extinction rates can be partially explained by

A. Natural selection in small populations

B. Over harvesting by humans

C. Plate tectonics and continental drift

D. Short term changes in present day environment

5. Fossil records are important for understanding change in living organism however there are multiple limitations including ( choose all that apply )

1. Evolutionary trends in fossils may change when new fossils are found

2. Some organisms do not create fossils

3. Fossil records are biased towards certain types of species

4. Not all fossils have been found

HELP WITH BIO MULTI CHOICE QUESTIONS:

QUESTION 2

Which of the following structures discussed in class is NOT found on all bacteria?
Flagella
Capsid
Fimbria
Plasma membrane

QUESTION 3
You are presented with a strain of bacteria that is resistant to the antibiotic penicillin. What steps would you take to confirm that you have a resistant bacterium?
Perform a Gram stain to determine pink stained Gram-positive bacteria.
Perform a Gram stain to determine purple stained Gram-positive bacteria.
Perform a Gram stain to determine pink stained Gram-negative bacteria.
Perform a Gram stain to determine purple stained Gram-negative bacteria.

QUESTION 4
With respect to bacterial growth into a fresh culture tube containing nutrient broth, at which phase do organisms undergo binary fission the most rapidly?
Lag phase
Stationary
Exponential
death

QUESTION 5
How would antibiotic resistance be passed from one bacterium to another bacterium?
Through the flagella via a plasmid.
Through the sex pilus via chromosomal DNA.
Through the sex pilus via a plasmid.
Through the flagella via chromosomal DNA.

QUESTION 6
When an F plasmid integrates into the host chromosome, the strain is referred to as

Hfr.
F'.
F-.
F+.

QUESTION 7
If you remove the peptidoglycan layer from a Gram-positive cell, it would still stain purple with a Gram stain (T/F).
True
False

QUESTION 8
During infection with a bacteriophage, bacterial DNA is packaged into a capsid and will:

be integrated into the genome of a new bacterium upon ligation.
be integrated into the genome of a new virion upon recombination.
be integrated into the genome of a new bacterium upon recombination.
be integrated into the genome of a new virion upon liagation.

QUESTION 9
Which of the following statements best describes most bacteria?
They are generally harmful.
They are limited to living in a few habitats.
They are very common in the environment.
They are responsible for the âcommon cold.â

QUESTION 10
Prokaryotes lack some parts found in eukaryotic cells, including which item?
a nuclear membrane
DNA
one or more chromosomes
a plasma membrane
all of the above

QUESTION 11
With respect to gram negative bacteria, what is the order of the bacterial cell structure from outside to inside?
Thin peptidoglycan layer, plasma membrane

thick peptidoglycan layer, plasma membrane

outer membrane, thick peptidoglycan layer, plasma membrane

outer membrane, thin peptidoglycan layer, plasma membrane

QUESTION 12
In transformation, a piece of DNA from a dead host can be taken up by living host

True
False

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True

False

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Question 421 pts

Changing the number of ____________ of an atom would change the chemical properties of the atom.

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Question 431 pts

Forming molecules and breaking down molecules in biological organisms usually requires the use of _________ to help the reaction proceed faster.

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Question 441 pts

Organic molecules have a core composed of .

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Question 451 pts

The building blocks of carbohydrates are

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cell fate

facilitated diffusion

osmosis

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phospholipids

transmembrane channel proteins

cell surface proteins

carbohydrate chains

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Question 481 pts

The simplest cells are .

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Question 491 pts

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nucleus

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mitochondria

chloroplasts

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ribosomes

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A water molecule is added to the molecules

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NH2

R Group or functional group

COOH

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Question 561 pts

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all statements are differences between DNA and RNA.

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phosphate

a nitrogen containing base

All are components of a nucleotide.

5-carbon sugar

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transmembrane proteins

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