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Problem 27.1a
For questions 1–4, answer whether
a. the process takes place under aerobic conditions.
b. the process takes place under anaerobic conditions.
c. the amount of oxygen doesn’t make any difference.
Activated sludge system
Problem 27.2a
For questions 1–4, answer whether
a. the process takes place under aerobic conditions.
b. the process takes place under anaerobic conditions.
c. the amount of oxygen doesn’t make any difference.
Denitrification
Problem 27.3a
In the sulfur cycle, microbes degrade organic sulfur compounds, such as (a) _________________, to release H₂S, which can be oxidized by Acidithiobacillus to (b) _________________. This ion can be assimilated into amino acids by (c) _________________ or reduced by Desulfovibrio to (d) _________________. H₂S is used by photoautotrophic bacteria as an electron donor to synthesize (e) _________________. The sulfur-containing by-product of this metabolism is (f) _________________.
Problem 27.3a
For questions 1–4, answer whether
a. the process takes place under aerobic conditions.
b. the process takes place under anaerobic conditions.
c. the amount of oxygen doesn’t make any difference.
Nitrogen fixation
Problem 27.4a
Why is the phosphorus cycle important?
Problem 27.4a
For questions 1–4, answer whether
a. the process takes place under aerobic conditions.
b. the process takes place under anaerobic conditions.
c. the amount of oxygen doesn’t make any difference.
Methane production
Problem 27.6a
Use the following choices to answer questions 6–8:
a. aerobic respiration
b. anaerobic respiration
c. anoxygenic photosynthesis
d. oxygenic photosynthesis
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Problem 27.7a
Use the following choices to answer questions 6–8:
a. aerobic respiration
b. anaerobic respiration
c. anoxygenic photosynthesis
d. oxygenic photosynthesis
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Problem 27.8a
Use the following choices to answer questions 6–8:
a. aerobic respiration
b. anaerobic respiration
c. anoxygenic photosynthesis
d. oxygenic photosynthesis
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Problem 28.10a
Which of the following reactions is an oxidation carried out by A. ferrooxidans?
a. Fe²⁺ → Fe³⁺
b. Fe³⁺ → Fe²⁺
c. CuS→ CuSO₄
d. Fe⁰ → Cu⁰
e. none of the above
Problem 28.7a
Which one of the following is not a fuel produced by microorganisms?
a. algal oil
b. ethanol
c. hydrogen
d. methane
e. uranium
Problem 28.8a
Describe an example of bioconversion. What metabolic processes can result in fuels?
Problem 28.9a
Which of the following reactions is undesirable in winemaking?
a. Sucrose → ethanol
b. Ethanol → acetic acid
c. Malic acid → lactic acid
d. Glucose →pyruvic acid