Question 1

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

Accepted Answer

A)   psychrophiles
B)   thermophiles
C)   barophiles
D)   extremophiles
E)   halophilesF) C) and E)
G) A) and B)

Question 2

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Accepted Answer

A)   trace elements
B)   growth factors
C)   electrolytes
D)   water
E)   macronutrientsF) A) and B)
G) A) and C)

Question 3

A saprobe with a cell wall will utilize extracellular digestion.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A)   saprobe
B)   chemoheterotroph
C)   photoautotroph
D)   heterotroph
E)   halotrophF) A) and C)
G) A) and E)

Question 5

The movement of substances from lower to higher concentration across a semipermeable membrane via a speciﬁc protein carrier and cell expenditure of energy is called ______.

Accepted Answer

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

Question 6

What type of medium is used to demonstrate oxygen requirements of microbes?

Accepted Answer

A)   Sulﬁte polymyxin sulfadiazine
B)   Sodium chloride
C)   Thioglycollate
D)   Blood agarE) A) and C)
F) B) and D)

Question 7

You have inoculated a Clostridium species into a tube of media. After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe. What is the best explanation for the observed lack of growth?

Accepted Answer

A)   There is not enough water in the environment for Clostridium to grow.
B)   Oxygen in the medium destroys the enzymes needed by Clostridium to undergo aerobic respiration.
C)   Clostridium does not have enzymes to process toxic oxygen.
D)   There is not enough oxygen for use when toxic oxygen is present.E) B) and D)
F) A) and D)

Question 8

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

Accepted Answer

A)   extremophile
B)   facultative psychrophile
C)   psychrophile
D)   thermoduric microbe
E)   thermophileF) A) and B)
G) A) and E)

Question 9

In the viable plate count method, a measured volume of a culture is evenly spread across an agar surface and incubated. Each _____ represents one _____ from the original sample.

Accepted Answer

A)   species; colony
B)   colony; cell
C)   generation; cell
D)   cell; cell
E)   cell; colonyF) All of the above
G) A) and D)

Question 10

An organism that cannot grow without oxygen is a/an ______.

Accepted Answer

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

Question 11

Organisms called _______ live on or in the body of a host and cause some degree of harm.

Accepted Answer

A)   halophiles
B)   mesophiles
C)   aerobes
D)   commensals
E)   pathogensF) C) and D)
G) C) and E)

Question 12

An important mineral ion found in the cytochrome pigments of cellular respiration is ______.

Accepted Answer

A)   iron
B)   magnesium
C)   potassium
D)   zinc
E)   calciumF) A) and D)
G) B) and E)

Question 13

This microbe is photosynthetic, but in the absence of light it can use organic compounds as an energy source. Its carbon source is an organic compound. The appropriate classi?cation for this organism would be ______.

Accepted Answer

A)   chemoautotroph
B)   photoheterotroph
C)   lithotroph
D)   photoautotrophE) A) and B)
F) All of the above

Question 14

Which of the following require the cell to use energy?

Accepted Answer

A)   Diffusion
B)   Endocytosis
C)   Facilitated diffusion
D)   OsmosisE) None of the above
F) A) and C)

Question 15

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

Accepted Answer

A)   psychrophiles
B)   anaerobes
C)   capnophiles
D)   facultative anaerobes
E)   mesophilesF) A) and B)
G) A) and C)

Question 16

In a commensal relationship, the commensal bene?ts but the cohabitant is neither harmed nor bene?ted.

Accepted Answer

A) True 
 B)False

Question 17

Which statement is correct regarding microbial growth on food at refrigeration temperatures?

Accepted Answer

A)   The growth of microbes in food depends on their optimal growth temperature; some grow slowly and others faster.
B)   There is no growth of microbes in food in the refrigerator; the cold temperature kills or inactivates microbial cells.
C)   The absence of light in the refrigerator greatly reduces the growth of most microbial pathogens.
D)   Most food does not have enough oxygen content for microorganisms to thrive.E) A) and B)
F) All of the above

Exam 7: Microbial Nutrition and Growth

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

Correct Answer
verified

An important mineral ion found in the cytochrome pigments of cellular respiration is ______.

Correct Answer
verified

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Correct Answer
verified

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

Correct Answer
verified

What type of medium is used to demonstrate oxygen requirements of microbes?

Correct Answer
verified

Which of the following require the cell to use energy?

Correct Answer
verified

An organism that cannot grow without oxygen is a/an ______.

Correct Answer
verified

This microbe is photosynthetic, but in the absence of light it can use organic compounds as an energy source. Its carbon source is an organic compound. The appropriate classi?cation for this organism would be ______.

Correct Answer
verified

A saprobe with a cell wall will utilize extracellular digestion.

Correct Answer
verified

You have inoculated a Clostridium species into a tube of media. After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe. What is the best explanation for the observed lack of growth?

Correct Answer
verified

In a commensal relationship, the commensal bene?ts but the cohabitant is neither harmed nor bene?ted.

Correct Answer
verified

Organisms called _______ live on or in the body of a host and cause some degree of harm.

Correct Answer
verified

The movement of substances from lower to higher concentration across a semipermeable membrane via a speciﬁc protein carrier and cell expenditure of energy is called ______.

Correct Answer
verified

In the viable plate count method, a measured volume of a culture is evenly spread across an agar surface and incubated. Each _ represents one _ from the original sample.

Correct Answer
verified

Which statement is correct regarding microbial growth on food at refrigeration temperatures?

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

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

Correct Answer
verified

Exam 7: Microbial Nutrition and Growth

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

Correct AnswerverifiedShow Answer

An important mineral ion found in the cytochrome pigments of cellular respiration is ______.

Correct AnswerverifiedShow Answer

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What type of medium is used to demonstrate oxygen requirements of microbes?

Correct AnswerverifiedShow Answer

Which of the following require the cell to use energy?

Correct AnswerverifiedShow Answer

An organism that cannot grow without oxygen is a/an ______.

Correct AnswerverifiedShow Answer

This microbe is photosynthetic, but in the absence of light it can use organic compounds as an energy source. Its carbon source is an organic compound. The appropriate classi?cation for this organism would be ______.

Correct AnswerverifiedShow Answer

A saprobe with a cell wall will utilize extracellular digestion.

Correct AnswerverifiedShow Answer

You have inoculated a Clostridium species into a tube of media. After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe. What is the best explanation for the observed lack of growth?

Correct AnswerverifiedShow Answer

In a commensal relationship, the commensal bene?ts but the cohabitant is neither harmed nor bene?ted.

Correct AnswerverifiedShow Answer

Organisms called _______ live on or in the body of a host and cause some degree of harm.

Correct AnswerverifiedShow Answer

The movement of substances from lower to higher concentration across a semipermeable membrane via a speciﬁc protein carrier and cell expenditure of energy is called ______.

Correct AnswerverifiedShow Answer

In the viable plate count method, a measured volume of a culture is evenly spread across an agar surface and incubated. Each _____ represents one _____ from the original sample.

Correct AnswerverifiedShow Answer

Which statement is correct regarding microbial growth on food at refrigeration temperatures?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the viable plate count method, a measured volume of a culture is evenly spread across an agar surface and incubated. Each _ represents one _ from the original sample.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified