Question 1

Blood agar is both a differential and enriched medium.

Accepted Answer

A) True 
 B)False

Question 2

Agar is an excellent solidifying agent for microbiological media because

Accepted Answer

A)   it is not degraded by most microorganisms.
B)   solid agar remains solid until the temperature is raised to 90 °\degree° C, and liquid agar remains liquid if the temperature is lowered to 45 °\degree° C.
C)   it is not degraded by most microorganisms and solid agar remains solid until the temperature is raised to 90 °\degree° C, and liquid agar remains liquid if the temperature is lowered to 45 °\degree° C are correct.
D)   agar provides an excellent source of nutrition for a variety of different microorganisms. E) A) and B)
F) B) and D)

Question 3

The extreme insolubility of ferric iron leaves little free iron available for transport into bacterial cells.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is a characteristic of active transport?

Accepted Answer

A)   saturable uptake rate
B)   use of ATP or a proton gradient as a source of metabolic energy
C)   can move materials against a concentration gradient
D)   all of the choicesE) C) and D)
F) B) and C)

Question 5

Elements that are required in relatively large amounts by microorganisms are called

Accepted Answer

A)   multivitamins.
B)   meganutrients.
C)   macronutrients.
D)   macromolecules.E) B) and C)
F) B) and D)

Question 6

Phosphorus can be obtained from organic sources only.

Accepted Answer

A) True 
 B)False

Question 7

Mannitol salt agar (MSA)  only allows the growth of halophiles (salt-loving microbes) . Among the halophiles, mannitol fermenters release acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red. Onto MSA you inoculate a halophilic mannitol fermenter, a nonhalophilic mannitol fermenter, and a halophilic mannitol nonfermenter. Thus, the medium is acting as a __________ medium.

Accepted Answer

A)   selective
B)   differential
C)   selective and differential
D)   neither selective nor differentialE) A) and B)
F) A) and C)

Question 8

Organisms that obtain electrons from the oxidation of inorganic compounds are called

Accepted Answer

A)   chemotrophs.
B)   lithotrophs.
C)   organotrophs.
D)   phototrophs.E) None of the above
F) A) and D)

Question 9

Different transport systems for the same nutrient that are part of the same organism are usually regulated in different ways.

Accepted Answer

A) True 
 B)False

Question 10

__________ are carrier proteins embedded in the membrane that increase the rate of diffusion of specific molecules across selectively permeable membranes.

Accepted Answer

The answer of __________ are carrier proteins embedded in the...

Question 11

Transport of two different substances can be linked. If the transport is in the same direction it is called __________; if the transport is in opposite directions it is called __________.

Accepted Answer

The answer of Transport of two different substances can be...

Question 12

The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.

Accepted Answer

A) True 
 B)False

Question 13

Zinc (Zn) is considered a macronutrient.

Accepted Answer

A) True 
 B)False

Question 14

Media in which all components and their concentration are known are called __________ media.

Accepted Answer

A)   transport
B)   defined
C)   selective
D)   enrichmentE) B) and D)
F) None of the above

Question 15

The size and shape of a colony is not useful for identification of a microorganism because most microorganisms produce colonies that are indistinguishable from one another.

Accepted Answer

A) True 
 B)False

Question 16

You would like to culture a bacterium that is growing in the lung of a human patient with pneumonia. Which media would be of most use in culturing this organism?

Accepted Answer

A)   transport media
B)   mannitol salt agar
C)   MacConkey's agar
D)   complex medium supplemented with whole blood
E)   none of the choicesF) A) and B)
G) B) and E)

Question 17

A wide variety of microorganisms are commercially used to manufacture _________ for human consumption.

Accepted Answer

A)   vitamins
B)   sugars
C)   fatty acids
D)   none of the choicesE) All of the above
F) C) and D)

Exam 6: Microbial Nutrition

Elements that are required in relatively large amounts by microorganisms are called

Correct Answer
verified

Transport of two different substances can be linked. If the transport is in the same direction it is called ; if the transport is in opposite directions it is called .

Correct Answer
verified

You would like to culture a bacterium that is growing in the lung of a human patient with pneumonia. Which media would be of most use in culturing this organism?

Correct Answer
verified

Media in which all components and their concentration are known are called __________ media.

Correct Answer
verified

Different transport systems for the same nutrient that are part of the same organism are usually regulated in different ways.

Correct Answer
verified

A wide variety of microorganisms are commercially used to manufacture _________ for human consumption.

Correct Answer
verified

The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.

Correct Answer
verified

Organisms that obtain electrons from the oxidation of inorganic compounds are called

Correct Answer
verified

__________ are carrier proteins embedded in the membrane that increase the rate of diffusion of specific molecules across selectively permeable membranes.

Correct Answer
verified

The extreme insolubility of ferric iron leaves little free iron available for transport into bacterial cells.

Correct Answer
verified

Phosphorus can be obtained from organic sources only.

Correct Answer
verified

Agar is an excellent solidifying agent for microbiological media because

Correct Answer
verified

Correct Answer
verified

Blood agar is both a differential and enriched medium.

Correct Answer
verified

The size and shape of a colony is not useful for identification of a microorganism because most microorganisms produce colonies that are indistinguishable from one another.

Correct Answer
verified

Which of the following is a characteristic of active transport?

Correct Answer
verified

Zinc (Zn) is considered a macronutrient.

Correct Answer
verified

Exam 6: Microbial Nutrition

Elements that are required in relatively large amounts by microorganisms are called

Correct AnswerverifiedShow Answer

Transport of two different substances can be linked. If the transport is in the same direction it is called __________; if the transport is in opposite directions it is called __________.

Correct AnswerverifiedShow Answer

You would like to culture a bacterium that is growing in the lung of a human patient with pneumonia. Which media would be of most use in culturing this organism?

Correct AnswerverifiedShow Answer

Media in which all components and their concentration are known are called __________ media.

Correct AnswerverifiedShow Answer

Different transport systems for the same nutrient that are part of the same organism are usually regulated in different ways.

Correct AnswerverifiedShow Answer

A wide variety of microorganisms are commercially used to manufacture _________ for human consumption.

Correct AnswerverifiedShow Answer

The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.

Correct AnswerverifiedShow Answer

Organisms that obtain electrons from the oxidation of inorganic compounds are called

Correct AnswerverifiedShow Answer

__________ are carrier proteins embedded in the membrane that increase the rate of diffusion of specific molecules across selectively permeable membranes.

Correct AnswerverifiedShow Answer

The extreme insolubility of ferric iron leaves little free iron available for transport into bacterial cells.

Correct AnswerverifiedShow Answer

Phosphorus can be obtained from organic sources only.

Correct AnswerverifiedShow Answer

Agar is an excellent solidifying agent for microbiological media because

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Blood agar is both a differential and enriched medium.

Correct AnswerverifiedShow Answer

The size and shape of a colony is not useful for identification of a microorganism because most microorganisms produce colonies that are indistinguishable from one another.

Correct AnswerverifiedShow Answer

Which of the following is a characteristic of active transport?

Correct AnswerverifiedShow Answer

Zinc (Zn) is considered a macronutrient.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Transport of two different substances can be linked. If the transport is in the same direction it is called ; if the transport is in opposite directions it is called .

Correct Answer
verified

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