Question 1

When microbes are in a close nutritional relationship and one benefits but the other is not harmed, it is called ______.

Accepted Answer

A)  mutualism
B)  commensalism
C)  synergism
D)  symbiosisE) A) and B)
F) None of the above

Question 2

Anaerobes can be cultured in a CO2 environment.

Accepted Answer

A) True 
 B)False

Question 3

An organism that cannot tolerate an oxygen environment is a(n)  ______.

Accepted Answer

A)  obligate anaerobe
B)  obligate aerobe
C)  facultative anaerobe
D)  aerobe
E)  microaerophileF) C) and D)
G) A) and C) A

Question 4

Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood.The protozoan uses the end products of the cellulose breakdown (glucose) .This is a(n)  ______ relationship.

Accepted Answer

A)  antagonistic
B)  mutualistic
C)  parasitic
D)  commensualisticE) A) and B)
F) A) and C) B

Question 5

A Coulter counter can count viable cells as well as determine their size.

Accepted Answer

A) True 
 B)False

Question 6

Obligate saprobes can adapt to a living host.

Accepted Answer

A) True 
 B)False

Question 7

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Accepted Answer

A) True 
 B)False

Question 8

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Accepted Answer

A)  superoxide dismutase and hydrogen peroxidase.
B)  superoxide dismutase and oxidase.
C)  superoxide dismutase and catalase.
D)  catalase and hydrogen peroxidase.
E)  catalase and oxidase.F) A) and D)
G) A) and C)

Question 9

Many lakes in the United States are suffering from periodic algae blooms, which can be thought of as an infection of the lake.Although the algae are naturally-occurring in the lake, when adjacent farm fields are over-fertilized with diammonium phosphate, the run-off deposits these nutrients in the lake, allowing the algae to grow without limit.Which of the following statements is incorrect regarding the overgrowth of algae?

Accepted Answer

A)  Lakes have sufficient micronutrients for algae to grow.
B)  The algae are heterotrophs.
C)  The nitrogen in the fertilizer is in the ammonium form, the preferred nitrogen source of most microbes.
D)  The phosphorus in the fertilizer is in the phosphate form, the preferred phosphorus source of most microbes.
E)  The carbon source for these algae is not limiting in lakes.F) C) and D)
G) C) and E)

Question 10

The production of antibiotics is a form of antagonism called ______.

Accepted Answer

A)  symbiosis
B)  synergism
C)  antibiosis
D)  mutualismE) A) and B)
F) C) and D)

Question 11

Inorganic nitrogen must be converted to ammonia to be used by a cell.

Accepted Answer

A) True 
 B)False

Question 12

Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?

Accepted Answer

A)  A protozoan in a fresh water lake
B)  A bacterium in a fresh-water lake
C)  A bacterium in Great Salt Lake
D)  All of the above have problems in maintaining electrolyte and fluid balance within the cell.E) All of the above
F) B) and C)

Question 13

Which of the following microorganisms would find hypotonic conditions most damaging?

Accepted Answer

A)  Bacteria
B)  Protozoa
C)  Algae
D)  Cyanobacteria
E)  FungiF) D) and E)
G) A) and B)

Question 14

A saprobe differs from a parasite in that

Accepted Answer

A)  a saprobe is a fungus, but a parasite can be any type of microbe.
B)  a saprobe cannot infect a human, but a parasite is always infectious.
C)  a saprobe derive nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals.
D)  a saprobe does not harm a host that it lives on, whereas a parasite does harm a host.E) A) and D)
F) A) and C)

Question 15

An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a ______.

Accepted Answer

A)  chemoheterotroph
B)  halotroph
C)  saprobe
D)  photoautotroph
E)  heterotrophF) A) and B)
G) A) and E) D

Question 16

Contractile vacuoles are

Accepted Answer

A)  used to expel excess water from cells.
B)  found in bacterial cells.
C)  important to certain organisms in hypertonic environments.
D)  protein carriers in cell membranes.
E)  used to bring solutes into a cell.F) C) and D)
G) A) and B)

Question 17

Microbes in a biofilm use quorum sensing to

Accepted Answer

A)  assess the size of a particular microbial population.
B)  transfer genetic material among individual cells.
C)  inactivate antibiotic molecules.
D)  attach to surfaces.E) All of the above
F) B) and D)

Question 18

Bacteria like
E.coli have an average generation time of 24 hours.

Accepted Answer

A) True 
 B)False

Question 19

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Accepted Answer

A) True 
 B)False

Question 20

The majority of microbes live and grow in habitats between pH 7 and 9.

Accepted Answer

A) True 
 B)False

Exam 7: Microbial Nutrition, Ecology, and Growth

When microbes are in a close nutritional relationship and one benefits but the other is not harmed, it is called ______.

Correct Answer
verified

Anaerobes can be cultured in a CO₂ environment.

Correct Answer
verified

An organism that cannot tolerate an oxygen environment is a(n) ______.

Correct Answer
verified
A

Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood.The protozoan uses the end products of the cellulose breakdown (glucose) .This is a(n) ______ relationship.

Correct Answer
verified
B

A Coulter counter can count viable cells as well as determine their size.

Correct Answer
verified

Obligate saprobes can adapt to a living host.

Correct Answer
verified

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Correct Answer
verified

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Correct Answer
verified

Correct Answer
verified

The production of antibiotics is a form of antagonism called ______.

Correct Answer
verified

Inorganic nitrogen must be converted to ammonia to be used by a cell.

Correct Answer
verified

Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?

Correct Answer
verified

Which of the following microorganisms would find hypotonic conditions most damaging?

Correct Answer
verified

A saprobe differs from a parasite in that

Correct Answer
verified

An organism that uses CO₂ for its carbon needs and sunlight for its energy needs would be called a ______.

Correct Answer
verified
D

Contractile vacuoles are

Correct Answer
verified

Microbes in a biofilm use quorum sensing to

Correct Answer
verified

Bacteria like E.coli have an average generation time of 24 hours.

Correct Answer
verified

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Correct Answer
verified

The majority of microbes live and grow in habitats between pH 7 and 9.

Correct Answer
verified

Exam 7: Microbial Nutrition, Ecology, and Growth

When microbes are in a close nutritional relationship and one benefits but the other is not harmed, it is called ______.

Correct AnswerverifiedShow Answer

Anaerobes can be cultured in a CO2 environment.

Correct AnswerverifiedShow Answer

An organism that cannot tolerate an oxygen environment is a(n) ______.

Correct AnswerverifiedA

Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood.The protozoan uses the end products of the cellulose breakdown (glucose) .This is a(n) ______ relationship.

Correct AnswerverifiedB

A Coulter counter can count viable cells as well as determine their size.

Correct AnswerverifiedShow Answer

Obligate saprobes can adapt to a living host.

Correct AnswerverifiedShow Answer

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Correct AnswerverifiedShow Answer

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The production of antibiotics is a form of antagonism called ______.

Correct AnswerverifiedShow Answer

Inorganic nitrogen must be converted to ammonia to be used by a cell.

Correct AnswerverifiedShow Answer

Which organism has a challenge to maintain cellular electrolyte and fluid balance in its environment?

Correct AnswerverifiedShow Answer

Which of the following microorganisms would find hypotonic conditions most damaging?

Correct AnswerverifiedShow Answer

A saprobe differs from a parasite in that

Correct AnswerverifiedShow Answer

An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a ______.

Correct AnswerverifiedD

Contractile vacuoles are

Correct AnswerverifiedShow Answer

Microbes in a biofilm use quorum sensing to

Correct AnswerverifiedShow Answer

Bacteria like E.coli have an average generation time of 24 hours.

Correct AnswerverifiedShow Answer

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Correct AnswerverifiedShow Answer

The majority of microbes live and grow in habitats between pH 7 and 9.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Anaerobes can be cultured in a CO₂ environment.

Correct Answer
verified

Correct Answer
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A

Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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An organism that uses CO₂ for its carbon needs and sunlight for its energy needs would be called a ______.

Correct Answer
verified
D

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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