Question 1

In small communities lacking municipal sewage systems, sewage is treated in septic systems or oxidation ponds.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is an assimilation process?

Accepted Answer

A)   Redwood tree: SO42- → Sulfhydryl groups of amino acids
B)   Desulfovibrio: SO42- → H2S
C)   Thiobacillus: H2S → S0
D)   Proteus: Sulfhydryl-containing amino acids → H2S
E)   Photosynthetic bacteria: H2S → S0F) B) and E)
G) C) and D)

Question 3

Which of the following organisms is using sulfur as a source of energy?

Accepted Answer

A)   Photosynthetic bacteria: H2S → S0
B)   Desulfovibrio: SO42- → H2S
C)   Redwood tree: SO42- → Amino acids
D)   Thiobacillus: H2S → S0
E)   Proteus: Amino acids → H2SF) A) and C)
G) A) and B)

Question 4

Which wastewater treatment process produces BOD-containing effluent used for irrigation?

Accepted Answer

A)   anaerobic sludge digestion
B)   primary sewage treatment
C)   secondary sewage treatment
D)   tertiary sewage treatment
E)   water treatmentF) A) and B)
G) B) and E)

Question 5

6H2S + 6Co2 light 6S0 + glucose 2S + 6Co2 light 6S0 + glucose   A)  takes place under aerobic conditions. B)  takes place under anaerobic conditions. C)  The amount of oxygen does not make any difference." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   takes place under aerobic conditions.
B)   takes place under anaerobic conditions.
C)   The amount of oxygen does not make any difference.D) B) and C)
E) A) and B)

Question 6

Which of the following is mismatched?

Accepted Answer

A)   N2 + 6H+ → 2NH3  Beijerinckia
B)   Co2 + 4H2 → CH4 + 2H2O  Methane-producing bacteria
C)   SO42- + 10H+ → H2S + 4H2O  Desulfovibrio
D)   6Co2 + 6H2O → C6H12O6 + 6o2  Clostridium
E)   2 No2- + o2→ 2 NO3  NitrobacterF) C) and E)
G) A) and E)

Question 7

Figure 27.1
 
-Which term in Figure 27.1 describes step V?

Accepted Answer

A)   nitrogen fixation
B)   ammonification
C)   nitrification
D)   dissimilation
E)   denitrificationF) A) and B)
G) A) and E)

Question 8

A newspaper headline reported ʺAlgal Bloom Kills Fish.ʺ What actually caused fish death, given that the algae were not toxic? What could have caused the algal bloom?

Accepted Answer

The answer of A newspaper headline reported ʺAlgal Bloom Kills...

Question 9

Nitrogen fixation by bacteria occurs only in the root nodules of leguminous plants.

Accepted Answer

A) True 
 B)False

Question 10

All of the following are used in secondary sewage treatment EXCEPT

Accepted Answer

A)   trickling filters.
B)   aeration.
C)   sludge granules or floc formation.
D)   activated sludge.
E)   anaerobic digestion.F) A) and B)
G) All of the above

Question 11

Bacteria can increase the Earthʹs temperature by

Accepted Answer

A)   using the greenhouse gas Co2.
B)   providing nutrients for plant growth.
C)   oxidizing CH4.
D)   producing CH4, which is a greenhouse gas.
E)   generating a great deal of heat in metabolism.F) C) and D)
G) B) and E)

Question 12

Drinking water supplies are routinely tested for the presence of

Accepted Answer

A)   Vibrio.
B)   Cryptosporidium.
C)   Giardia.
D)   fecal viruses.
E)   fecal coliforms.F) None of the above
G) A) and E)

Question 13

The guano deposited by seabirds is used a source for which of the following fertilizer components?

Accepted Answer

A)   nitrate
B)   carbonate
C)   potassium
D)   sulfate
E)   phosphateF) None of the above
G) A) and B)

Question 14

All of the following are true of mycorrhizae EXCEPT

Accepted Answer

A)   ectomycorrhizae extend the surface area of roots for nutrient absorption.
B)   they enable plants to absorb soil nutrients.
C)   an example is the food delicacy truffles.
D)   the vesicular-arbuscular mycorrhizae are a type of ectomycorrhizae.
E)   they are fungi that form beneficial relationships with plants.F) D) and E)
G) A) and E)

Question 15

The water from tertiary sewage treatment can be used as drinking water.

Accepted Answer

A) True 
 B)False

Question 16

Figure 27.1
 
-Which step in Figure 27.1 represents anaerobic respiration?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) A) and B)
G) C) and E)

Question 17

The BOD is a measurement of the amount of bacteria present before and after the sewage treatment process.

Accepted Answer

A) True 
 B)False

Question 18

Filtration to remove protozoa occurs in

Accepted Answer

A)   tertiary sewage treatment.
B)   secondary sewage treatment.
C)   water treatment.
D)   primary sewage treatment.
E)   anaerobic sludge digestion.F) C) and E)
G) A) and B)

Question 19

Bioremediation involves the use of microbes to degrade or detoxify pollutants.

Accepted Answer

A) True 
 B)False

Question 20

Untreated sewage is released into a river. Which of the following statements is FALSE?

Accepted Answer

A)   The untreated sewage increases the BOD.
B)   The untreated sewage is a health hazard.
C)   The untreated sewage kills bacteria.
D)   The untreated sewage decreases the dissolved oxygen.
E)   All of the statements are true.F) A) and E)
G) A) and D)

Exam 27: Environmental Microbiology

Which of the following organisms is using sulfur as a source of energy?

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Which wastewater treatment process produces BOD-containing effluent used for irrigation?

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Bioremediation involves the use of microbes to degrade or detoxify pollutants.

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Which of the following is mismatched?

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6H2S + 6Co2 light 6S0 + glucose

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Filtration to remove protozoa occurs in

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Figure 27.1 -Which term in Figure 27.1 describes step V?

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Drinking water supplies are routinely tested for the presence of

Correct AnswerverifiedShow Answer

Bacteria can increase the Earthʹs temperature by

Correct AnswerverifiedShow Answer

Which of the following is an assimilation process?

Correct AnswerverifiedShow Answer

The BOD is a measurement of the amount of bacteria present before and after the sewage treatment process.

Correct AnswerverifiedShow Answer

The guano deposited by seabirds is used a source for which of the following fertilizer components?

Correct AnswerverifiedShow Answer

A newspaper headline reported ʺAlgal Bloom Kills Fish.ʺ What actually caused fish death, given that the algae were not toxic? What could have caused the algal bloom?

Correct AnswerverifiedShow Answer

In small communities lacking municipal sewage systems, sewage is treated in septic systems or oxidation ponds.

Correct AnswerverifiedShow Answer

The water from tertiary sewage treatment can be used as drinking water.

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Untreated sewage is released into a river. Which of the following statements is FALSE?

Correct AnswerverifiedShow Answer

All of the following are true of mycorrhizae EXCEPT

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All of the following are used in secondary sewage treatment EXCEPT

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Nitrogen fixation by bacteria occurs only in the root nodules of leguminous plants.

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Figure 27.1 -Which step in Figure 27.1 represents anaerobic respiration?

Correct AnswerverifiedShow Answer

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6H₂S + 6Co₂ light 6S0 + glucose

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