1. Methanogens are Archaea that produce methane because a. they need the methane

Question

1. Methanogens are Archaea that produce methane because

a. they need the methane for cell materials

b. the methane decreases the pH and inhibits other microbes

c. it is a product of their anaerobic respiration

d. they use it as an electron donor for respiration

e. they live in an environment where methane is needed by other organisms

2. Removal of soluble nutrients from the wastewater stream requires

a. microbial incorporation of organic carbon into biomass

b. storage of phosphorus into cellular inclusions

c. proper floc formation to promote settling

d. a and b

e. a and b and c

3. Methanogens produce methane as the result of

a. fermentation of glucose

b. oxidation of butanol

c. reduction of carbon dioxide

d. hydrogen reduction

e. cell lysis

4. During wasterwater treatment, microbial nitrification is used to

a. decrease the ammount of soluble carbon to a reasonable level

b. sequester phosphate in intracellular granules

c. remove ammonia

d. remove pathogens

e. produce flocs that allow microbes to settle and be removed from the waste stream

5. Secondary treatment of wastewater most often invovles

a. microbial removal of organic carbon

b. production of flocs from microbial EPS that promote settling

c. production of phosphate inclusion for phosphate removal

d. predation by microbial eukaryotes

e. all of these are involved in the process

6. The typical electron acceptor for respiration in a denitrifying bacterium is

a. oxygen

b. carbon dioxide

c. pyruvate

d. nitrate

e. none of the above

7. Phosphate removal during wastewater treatment is accomplished by

a. chemical reducation of the phosphate to phosphorus gas

b. accumulation of phosphate intracellularly by microbes as polyphosphate

c. attachment of the phosphate to filters in the treatment plant

d. use of phosphate as electron acceptors for respiration, reducing it to phosphate

e. none of the above

8. One benefit of anaerobic waste digestion is the possibility of ___________ production for use as a fuel.

a. glucose

b. carbon dioxide

c. phosphate

d. methane

e. acetic acid

Explanation / Answer

1. c

2. a and b

3. c

4. c

5. a

6. d

7. a

8. d

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