Chapter 27 Environmental Microbiology

Chapter 27 Environmental Microbiology

27.1 Multiple-Choice Questions

1) All of the following are habitats for extremophiles EXCEPT A) an acid mine wash.
B) the topmost portions of the Atlantic Ocean. C) inside rock.
D) a salt-evaporating pond. E) 100°C water.

Answer: B Section: 27.1
Bloom's Taxonomy: Understanding
ASMcue Outcome: 5.1
Learning Outcome: 27.1

2) Which of the following organisms is using sulfur as a source of energy? A) Thiobacillus:
H2S → S0
B) Desulfovibrio: SO42- → H2S
C) Proteus: Amino acids → H2S
D) Redwood tree: SO42- → Amino acids
E) Photosynthetic bacteria: H2S → S0
Answer: A Section: 27.2
Bloom's Taxonomy: Understanding
ASMcue Outcome: 3.1
Learning Outcome: 27.8
Global Outcome: 2

3) Which of the following is NOT a symbiotic pair of organisms? A) elk and rumen bacteria
B) orchid and mycorrhizae
C) termites and cellulose-degrading bacteria
D) bean plant and Rhizobium E) sulfur and Thiobacillus Answer: E
Section: 27.1
Bloom's Taxonomy: Understanding
ASMcue Outcome: 5.1
Learning Outcome: 27.2
Global Outcome: 2
4) All of the following are true of mycorrhizae EXCEPT A) they are fungi that form beneficial
relationships with plants. B) an example is the food delicacy truffles.
C) the arbuscular mycorrhizae are a type of ectomycorrhizae. D) they enable plants to absorb
soil nutrients.
E) ectomycorrhizae extend the surface area of roots for nutrient absorption.
Answer: C Section: 27.2
Bloom's Taxonomy: Understanding
ASMcue Outcome: 5.1
Learning Outcome: 27.3

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5) The guano deposited by seabirds is used a source for which of the following fertilizer
components? A) phosphate
B) nitrate
C) sulfate
D) carbonate E) potassium Answer: A Section: 27.2
Bloom's Taxonomy: Remembering
Learning Outcome: 27.10

6) Adding untreated sewage to a freshwater lake would cause the biochemical oxygen
demand to A) increase.
B) decrease.
C) stay the same.
D) The answer cannot be determined based on the information provided. Answer: A
Section: 27.3
Bloom's Taxonomy: Analyzing
ASMcue Outcome: 3.2
Learning Outcome: 27.20
Global Outcome: 2
7) In freshwater lakes and ponds, the majority of photosynthetic microbes are located in the
zone(s). A) benthic
B) profundal C) limnetic D) littoral
E) benthic and profundal
Answer: C Section: 27.3
Bloom's Taxonomy: Remembering
ASMcue Outcome: 5.1
Learning Outcome: 27.13

8) All of the following are used in secondary sewage treatment EXCEPT A) trickling filters.
B) sludge granules or floc formation. C) aeration.
D) anaerobic digestion. E) activated sludge. Answer: D
Section: 27.3

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Bloom's Taxonomy: Understanding
ASMcue Outcome: 6.3
Learning Outcome: 27.18
Global Outcome: 5

9) 6H2S + 6CO2 6S0 + glucose
A) takes place under aerobic conditions.
B) takes place under anaerobic conditions.
C) The amount of oxygen does not make any difference. Answer: B
Section: 27.2
Bloom's Taxonomy: Understanding
ASMcue Outcome: 3.1
Learning Outcome: 27.8
Global Outcome: 2
10) Which of the following requires aerobic conditions? A) nitrogen fixation
B) sludge digestion
C) primary sewage treatment
D) secondary sewage treatment
E) water treatment Answer: D Section: 27.3
Bloom's Taxonomy: Understanding
ASMcue Outcome: 6.3
Learning Outcome: 27.18
Global Outcome: 5

11) All of the following organisms are involved in carbon fixation EXCEPT A) green and
purple sulfur bacteria.
B) cyanobacteria. C) lichens.
D) algae.
E) mycorrhizae. Answer: E Section: 27.2
Bloom's Taxonomy: Understanding
ASMcue Outcome: 6.1
Learning Outcome: 27.10
Global Outcome: 2
12) Fill in the blanks with the most appropriate set of terms. In sludge
a(n) digester,
bacteria decrease organic solids by degrading them.