BIOA01H3 Chapter 3: Chapter 3-Exploring the Diversity of Life

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29 Sep 2011

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: most plants are autotrophs which synthesize organic carbon molecules: autotrophs (self-nourishment) using inorganic carbon, heterotrophs. Selection occurs when : some force or phenomenon affects the survival of individual organisms. (ex. an unexpected spring frost can kill many plants in your garden. Only the cold-resistant plants survive the selective force (temperature). : a large population of individuals is exposed to a lethal factor and only resistant individuals survive to reproduce. If resistance is inherited, then the offspring of survivors will be resistant. The key factors behind selection are a selective force (pressure) and the capacity for explosive population growth. When these factors overlap, we can be overrun by pests, such as antibiotic-resistant bacteria. When this happens, the consequences for humans can be deadly. Selection is the major force responsible for evolution and biodiversity: evolution: a gradual change in the characteristics of a population of organisms over time can be the result of.

Related Questions

1. Which statement is FALSE regarding bacterial and archaeal cells?

Select one:

A. Archaeal and bacterial plasma membranes consist of a thin bilayer of lipid molecules penetrated by proteins.

B. Bacteria and archaea have group specific specializations in their cell envelope.

C. Archaea can have a single- or double-layered membrane.

D. Bacteria can have a single- or double-layered membrane.

E. Both bacteria and archaea have a layer of peptidoglycan in their cell envelope.

2.Which reason is MOST probable for why carbon is used in living organisms but not silicon?

Select one:

A. Carbon can make four bonds, whereas silicon can only make three.

B. Silicon is heavier, and therefore its bonds are stronger.

C. Carbon can form more preferred geometries when bonding.

D. Carbon is lighter, and therefore its bonds are stronger.

E. Carbon can make double bonds, but silicon cannot.

Which statement is TRUE regarding energy sources used by organisms?

Select one:

A. All phototrophs are autotrophs that can use carbon dioxide as a carbon source.

B. Phototrophs can use carbon dioxide as an energy source.

C. Phototrophs can use carbon dioxide as a carbon source.

D. All phototrophs are autotrophs.

E. All chemotrophs are heterotrophs.

-Glucose fermentation by some microbes results in the accumulation of acids such as acetate and lactate in the medium. The acid byproducts are necessary toâ¦

a. Increase in ATP production by substrate level phosphorylation

b. increase ATP production by respiration

c. achieve redox balance

d. reverse electron transport to generate reducing power

e. disrupt energy transport

- Which of the following statements comparing and contrasting heterotrophs and autotrophs is NOT true:

a. Both herterotrops and autptrophs synthesize precursor metabolites

b. Heterophs use organic carbon sources as engery sources whereas autotrophs use carbon dioxide as carbon sources only

c. Heterophs cannot be phototrophs

d. Heterotrophs and autotrophs can harness energy from light

scarletreindeer378

Microbiology Unit 2 Applied and Environmental Assignment Part 1:

Identify Nutritional requirements from Chapter 6 & 14 (and review from chapters 1 & 2)

1. Determine which of the 4 macromolecules require the following elements:

a. Carbon: carbohydrates___ lipids___ proteins___ nucleic acids___

b. Nitrogen: carbohydrates___ lipids___ proteins___ nucleic acids___

c. Sulfur: carbohydrates___ lipids___ proteins___ nucleic acids___

2. The essential elements mentioned above are cycled through cells and the earth in biogeochemical cycles like the carbon cycle, the nitrogen cycle, and the sulfur cycle. Select the correct answer and fill in the blanks to summarize these cycles:

a. Carbon dioxide is taken in from the atmosphere by [autotrophs/heterotrophs] and converted to glucose through carbon ________________. When heterotrophs eat autotrophs they catabolize glucose to make ATP through __________________ and waste carbon is released as ___________.

b. There is plenty of nitrogen available in the atmosphere but it is not accessible to organisms because it is in the form of Nitrogen gas (N2). N2 is fixed by [bacteria/plants/animals] and converted to ammonia (NH3.) NH3 can be used by [bacteria/plants/animals] to build their cells. Next, by consuming food with amino acids, [bacteria/plants/animals] can get access to nitrogen for their own cellular needs.

c. There is also a good quantity of sulfur in dirt, rocks, and the atmosphere. Sulfur cycles between H2S => S0 => SO4 => SH groups in Proteins => back to H2S. Using _________________ respiration, anoxygenic photosynthesis, and chemolithoautotrophy [bacteria/plants/animals] convert H2S and S0 to SO4 which is taken in by [bacteria/plants/animals] and used to build their cells. When [bacteria/plants/animals] eat plants they take in essential amino acids containing sulfur and recycle these to make their own proteins.

d. _________________ break down waste and dead organisms and recycle nutrients back into the cycles.

*The C and N are summarized here: https://youtu.be/2D7hZpIYlCA and https://youtu.be/leHy-Y_8nRs

3. Identify the main metabolic classifications:

A microbe that makes its own food by taking carbon from CO₂ in the atmosphere and its energy from sunlight
A microbe that makes its own food by taking carbon from CO₂ in the atmosphere and its energy from reduced inorganic chemicals
A microbe that eats other organisms to get organic carbon and energy
A microbe that uses organic carbon from others but energy from sunlight

Please help me with my microbiology assignment.

orchidherring991

BIOA01H3 Chapter 3: Chapter 3-Exploring the Diversity of Life

BIOA01H3 Full Course Notes

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