Question 1

When methanogens convert carbon dioxide to methane,it is a(n) ______ reaction.

Accepted Answer

A)   aerobic
B)   oxidation
C)   reduction
D)   ammonificationE) A) and B)
F) All of the above

Question 2

Which of the following statements regarding biogeochemical cycles is incorrect?

Accepted Answer

A)   Recycling keeps nutrients in balance.
B)   All elements originate from a nonliving, long-term reservoir.
C)   All organisms directly participate in recycling.
D)   Cycles are simple systems between living and nonliving components.
E)   Elements cycle through biotic and abiotic environments.F) A) and B)
G) A) and C)

Question 3

The bacterium Thiobacillus secretes sulfuric acid into the environment.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following types of microbes is most likely to be found in the sediment of Lake Michigan?

Accepted Answer

A)   Mesophiles; temperatures in the hypolimnion support growth in the 4-9°C range
B)   Autotrophs; their carbon source is dissolved carbon dioxide
C)   Cyanobacteria; seasonal upwelling of nutrients can cause dramatic increases in their numbers
D)   Anaerobes; oxygen is least abundant in the sediment layerE) A) and B)
F) All of the above

Question 5

Consider a deep sea hydrothermal vent.Which of the following statements is incorrect?

Accepted Answer

A)   Its biome is the deep marine biopshere.
B)   The vent hosts communities of chemolithotrophic bacteria.
C)   The associated chemolithotrophs are primary producers.
D)   The vent is a habitat.E) A) and C)
F) A) and D)

Question 6

Scientists have learned the full extent of viral abundance on earth because

Accepted Answer

A)   the final step of the viral life cycle, release of mature viruses and cell lysis, releases millions of viruses.
B)   metagenomic sequencing has identified viruses in a broad variety of environments.
C)   a wide variety of microbes is available to act as hosts for these viruses.
D)   viruses are known to grow on all life forms: animal, plant, fungi, and bacteria.E) None of the above
F) A) and B)

Question 7

How are the sulfur cycle and the phosphate cycle interconnected?

Accepted Answer

A)   Phosphate is the nutrient source used by sulfur oxidizers.
B)   Sulfite is the nutrient used by phosphate reducers.
C)   Sulfate and phosphate react together to produce amino acids for protein production.
D)   Phosphate is released from rock and soil by sulfuric acid.E) A) and B)
F) C) and D)

Question 8

A collection of organisms,together with the physical and chemical factors in their environment,are called a(n)  ______.

Accepted Answer

A)   hydrosphere
B)   lithosphere
C)   ecosystem
D)   atmosphere
E)   biosphereF) B) and E)
G) All of the above

Question 9

Organisms whose sole source of carbon for growth is CO2 are called ______.

Accepted Answer

A)   consumers
B)   autotrophs
C)   decomposers
D)   saprophytes
E)   lithotrophsF) C) and E)
G) None of the above

Question 10

Eutrophication

Accepted Answer

A)   restricts the O2 supply to water below the surface.
B)   is characterized by heavy surface algal blooms.
C)   occurs when there are excess nutrients in aquatic ecosystems.
D)   causes massive die-off of fish and invertebrates.
E)   All of the choices are correct.F) B) and E)
G) All of the above

Question 11

Nutrient deficient aquatic ecosystems are called ______.

Accepted Answer

A)   oligotrophic
B)   autotrophic
C)   hypotrophic
D)   epitrophic
E)   eutrophicF) C) and D)
G) None of the above

Question 12

Heterotrophs include

Accepted Answer

A)   producers only.
B)   consumers only.
C)   consumers and decomposers.
D)   producers and consumers.
E)   producers, consumers, and decomposers.F) A) and B)
G) A) and C)

Question 13

Which crop plant would likely have a mutualistic relationship with Rhizobium bacteria?

Accepted Answer

A)   Potatoes
B)   Peas
C)   Corn
D)   Wheat
E)   CottonF) D) and E)
G) None of the above

Question 14

Methane is a significant part of the carbon cycle in ______ environments dominated by methanogens.

Accepted Answer

A)   autotrophic
B)   anaerobic
C)   thermophilic
D)   oligotrophicE) A) and B)
F) None of the above

Question 15

The physical location in the environment to which an organism has adapted is its ______.

Accepted Answer

A)   biome
B)   community
C)   habitat
D)   niche
E)   populationF) A) and B)
G) A) and C)

Question 16

The study of the practical uses of microbes in various industries and technologies is ______.

Accepted Answer

A)   applied microbiology
B)   bioengineering
C)   industrial microbiology
D)   biotechnology
E)   microbial ecologyF) A) and B)
G) B) and E)

Question 17

Which trophic level forms the base of a food chain?

Accepted Answer

A)   Primary producers
B)   Quaternary consumers
C)   Tertiary consumers
D)   Secondary consumers
E)   Primary consumersF) A) and B)
G) C) and E)

Question 18

Living or dead organisms that occupy an organism's habitat are called biotic factors.

Accepted Answer

A) True 
 B)False

Question 19

The study of interactions between microbes and their environment and how those interactions affect the earth is called ______.

Accepted Answer

A)   applied microbiology
B)   bioengineering
C)   microbial ecology
D)   industrial microbiology
E)   biotechnologyF) A) and E)
G) C) and D)

Question 20

The energy of the sun is converted into chemical energy during ______.

Accepted Answer

A)   nitrification
B)   denitrification
C)   photosynthesis
D)   ammonification
E)   nitrogen fixationF) A) and C)
G) A) and B)

Exam 24: Microbes and the Environment

Organisms whose sole source of carbon for growth is CO2 are called ______.

Correct AnswerverifiedShow Answer

When methanogens convert carbon dioxide to methane,it is a(n) ______ reaction.

Correct AnswerverifiedShow Answer

The study of the practical uses of microbes in various industries and technologies is ______.

Correct AnswerverifiedShow Answer

The physical location in the environment to which an organism has adapted is its ______.

Correct AnswerverifiedShow Answer

Living or dead organisms that occupy an organism's habitat are called biotic factors.

Correct AnswerverifiedShow Answer

How are the sulfur cycle and the phosphate cycle interconnected?

Correct AnswerverifiedShow Answer

The bacterium Thiobacillus secretes sulfuric acid into the environment.

Correct AnswerverifiedShow Answer

Eutrophication

Correct AnswerverifiedShow Answer

Nutrient deficient aquatic ecosystems are called ______.

Correct AnswerverifiedShow Answer

Which of the following statements regarding biogeochemical cycles is incorrect?

Correct AnswerverifiedShow Answer

The energy of the sun is converted into chemical energy during ______.

Correct AnswerverifiedShow Answer

Which trophic level forms the base of a food chain?

Correct AnswerverifiedShow Answer

Scientists have learned the full extent of viral abundance on earth because

Correct AnswerverifiedShow Answer

Consider a deep sea hydrothermal vent.Which of the following statements is incorrect?

Correct AnswerverifiedShow Answer

Methane is a significant part of the carbon cycle in ______ environments dominated by methanogens.

Correct AnswerverifiedShow Answer

Which crop plant would likely have a mutualistic relationship with Rhizobium bacteria?

Correct AnswerverifiedShow Answer

The study of interactions between microbes and their environment and how those interactions affect the earth is called ______.

Correct AnswerverifiedShow Answer

Heterotrophs include

Correct AnswerverifiedShow Answer

Which of the following types of microbes is most likely to be found in the sediment of Lake Michigan?

Correct AnswerverifiedShow Answer

A collection of organisms,together with the physical and chemical factors in their environment,are called a(n) ______.

Correct AnswerverifiedShow Answer

Organisms whose sole source of carbon for growth is CO₂ are called ______.

Correct Answer
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