Question 1

Which term describes human pathogens?

Accepted Answer

A)   psychrophiles
B)   thermophiles
C)   halophiles
D)   mesophiles
E)   acidophilesF) A) and B)
G) C) and D)

Question 2

The methanogens, producers of methane gas, require environments that

Accepted Answer

A)   have sunlight.
B)   are very acidic.
C)   have abundant oxygen and CO2.
D)   are extremely cold.
E)   are anaerobic with hydrogen gas and CO2.F) B) and D)
G) D) and E)

Question 3

The term autotroph refers to an organism that

Accepted Answer

A)   uses CO2 for its carbon source.
B)   must obtain organic compounds for its carbon needs.
C)   gets energy from sunlight.
D)   gets energy by oxidizing chemical compounds.
E)   does not need a carbon source.F) A) and E)
G) B) and C)

Question 4

In _____ conditions, the cell wall will help prevent the cell from bursting.

Accepted Answer

A)   hypertonic
B)   hypotonic
C)   isotonic
D)   mesotonic
E)   All of these choices are correct.F) None of the above
G) A) and D)

Question 5

A change in one partner in a close relationship that leads to a change in the other partner is

Accepted Answer

A)   symbiosis.
B)   coevolution.
C)   antibiosis.
D)   mutualism.
E)   synergism.F) C) and E)
G) A) and E)

Question 6

The

Accepted Answer

A)   parasitic
B)   saprobic
C)   commensal
D)   mutualistic
E)   coli that normally live in the human large intestines and produce vitamin K that the body uses would be best termed a _____ relationship.F) B) and E)
G) A) and E)

Question 7

The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called

Accepted Answer

A)   facilitated diffusion.
B)   diffusion.
C)   active transport.
D)   osmosis.
E)   endocytosis.F) B) and E)
G) D) and E)

Question 8

Which of the following terms refers to microorganisms that live in or on the body and cause harm?

Accepted Answer

A)   mesophiles
B)   thermophiles
C)   commensals
D)   pathogens
E)   halophilesF) B) and D)
G) B) and C)

Question 9

An organism that cannot grow without oxygen is an)

Accepted Answer

A)   aerobe.
B)   obligate aerobe.
C)   facultative anaerobe.
D)   microaerophile.
E)   obligate anaerobe.F) A) and D)
G) C) and D)

Question 10

The production of antibiotics is a form of amensalism called

Accepted Answer

A)   symbiosis.
B)   satellitism.
C)   antibiosis.
D)   mutualism.
E)   synergism.F) A) and B)
G) A) and C)

Question 11

Which two enzymes catalyze the steps converting the toxic superoxide ion to less harmful oxygen gas?

Accepted Answer

A)   catalase and hydrogen peroxidases
B)   superoxide dismutase and hydrogen peroxidase
C)   superoxide dismutase and catalase
D)   catalase and oxidase
E)   superoxide dismutase and oxidaseF) C) and D)
G) A) and D)

Question 12

All of the following could find a location in or on body tissues suitable for growth except

Accepted Answer

A)   psychrophiles.
B)   anaerobes.
C)   facultative anaerobes.
D)   mesophiles.
E)   capnophiles.F) A) and E)
G) A) and D)

Question 13

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is an)

Accepted Answer

A)   aerobe.
B)   obligate aerobe.
C)   facultative anaerobe.
D)   microaerophile.
E)   obligate anaerobe.F) A) and D)
G) B) and C)

Question 14

Bacterial biofilms stimulate the immune system differently than planktonic bacteria.

Accepted Answer

A) True 
 B)False

Question 15

A saprobe with a cell wall will utilize extracellular digestion.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

In a commensal relationship, the commensal benefits but the cohabitant is neither harmed nor benefited.

Accepted Answer

A) True 
 B)False

Question 18

An organism with a temperature growth range of 45°C to 60°C would be called

Accepted Answer

A)   an extremophile.
B)   a thermophile.
C)   a psychrophile.
D)   a facultative psychrophile.
E)   thermoduric.F) A) and E)
G) D) and E)

Question 19

Bacteria living in a freshwater stream that are moved to salty seawater would

Accepted Answer

A)   now be in a hypotonic solution.
B)   gain water as a result of the move.
C)   now be in a isotonic solution.
D)   shrivel as a result of the move.E) A) and C)
F) None of the above

Question 20

Microorganisms that live in severe habitats, such as very hot, acidic or salty environments, are called

Accepted Answer

A)   thermophiles.
B)   halophiles.
C)   psychrophiles.
D)   extremophiles.
E)   barophiles.F) B) and D)
G) C) and E)

Exam 7: Microbial Nutrition, Ecology, and Growth

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is an)

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A change in one partner in a close relationship that leads to a change in the other partner is

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Which of the following terms refers to microorganisms that live in or on the body and cause harm?

Correct AnswerverifiedShow Answer

The

Correct AnswerverifiedShow Answer

Microorganisms that live in severe habitats, such as very hot, acidic or salty environments, are called

Correct AnswerverifiedShow Answer

In _____ conditions, the cell wall will help prevent the cell from bursting.

Correct AnswerverifiedShow Answer

Bacteria living in a freshwater stream that are moved to salty seawater would

Correct AnswerverifiedShow Answer

A saprobe with a cell wall will utilize extracellular digestion.

Correct AnswerverifiedShow Answer

An organism with a temperature growth range of 45°C to 60°C would be called

Correct AnswerverifiedShow Answer

All of the following could find a location in or on body tissues suitable for growth except

Correct AnswerverifiedShow Answer

Which term describes human pathogens?

Correct AnswerverifiedShow Answer

The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called

Correct AnswerverifiedShow Answer

The production of antibiotics is a form of amensalism called

Correct AnswerverifiedShow Answer

Bacterial biofilms stimulate the immune system differently than planktonic bacteria.

Correct AnswerverifiedShow Answer

An organism that cannot grow without oxygen is an)

Correct AnswerverifiedShow Answer

The term autotroph refers to an organism that

Correct AnswerverifiedShow Answer

The methanogens, producers of methane gas, require environments that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a commensal relationship, the commensal benefits but the cohabitant is neither harmed nor benefited.

Correct AnswerverifiedShow Answer

Which two enzymes catalyze the steps converting the toxic superoxide ion to less harmful oxygen gas?

Correct AnswerverifiedShow Answer

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