Question 1

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

Accepted Answer

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

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

Question 3

Media containing some ingredients of unknown chemical composition are called __________ media.

Accepted Answer

A)  undefined
B)  complex
C)  defined
D)  syntheticE) A) and D)
F) B) and C)

Question 4

Quorum sensing in Gram-positive bacteria generally involves the use of ____________ as the external signaling molecules.

Accepted Answer

The answer of Quorum sensing in Gram-positive bacteria generally involves...

Question 5

The process of segregating the daughter chromosomes in Sulfolobus is more similar to the process in eukaryotic cells than in bacterial cells.

Accepted Answer

A) True 
 B)False

Question 6

For surface cultivation of microorganisms,a sulfated polymer called agar can be extracted from __________ and added to liquid media in order to cause it to solidify.

Accepted Answer

A)  bacteria
B)  animal fat
C)  algae
D)  fungiE) All of the above
F) C) and D)

Question 7

A growth medium that distinguishes among different groups of bacteria on the basis of their biological characteristics is called a __________ medium.

Accepted Answer

A)  selective
B)  differential
C)  enrichment
D)  transportE) A) and C)
F) None of the above

Question 8

What is the result of successful communication between rhizobia and their plant hosts?

Accepted Answer

A)  Rhizobia consume the plant tissue as an energy and carbon source,causing disease in the plant.
B)  The plant consumes rhizobiaas an energy source and carbon,destroying the invading bacteria.
C)  The rhizobia invade the plant root and begin to fix nitrogen with the assistance of the plant.
D)  The plant supplies organic forms of nitrogen to the rhizobia.E) B) and D)
F) All of the above

Question 9

Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes) ; nonhalophiles will not grow.Among the halophiles,mannitol fermenters will produce acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red.Onto MSA you inoculate a halophilic mannitol fermenter and a halophilic mannitol nonfermenter.In this case,the medium is acting as (a) __________ medium(s) .

Accepted Answer

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

Question 10

A microbiologist is trying to isolate a pathogen expected to be present in very small numbers from a stool specimen in which there are abundant normal microbiota.Which strategy would most likely accomplish this purpose?

Accepted Answer

A)  Culture on enriched media
B)  Enrichment culture followed by culture on selective agar
C)  Culture on differential media
D)  Culture in an anaerobe jarE) B) and D)
F) A) and B)

Question 11

Most microorganisms live in eutrophic environments.

Accepted Answer

A) True 
 B)False

Question 12

Microbial __________ is an increase in cell constituents that may or may not be accompanied by an increase in cell number.

Accepted Answer

The answer of Microbial __________ is an increase in cell...

Question 13

A given medium can be either selective or differential but not both.

Accepted Answer

A) True 
 B)False

Question 14

An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a

Accepted Answer

A)  manostat.
B)  chemostat.
C)  turbidostat.
D)  culturostat.E) All of the above
F) A) and D)

Question 15

Organisms that grow well at 0 ∘\circ∘ C and have optimum growth temperatures of 15 ∘\circ∘ C or lower are called

Accepted Answer

A)  psychrotrophs.
B)  psychrophiles.
C)  frigiphiles.
D)  mesophiles. E) All of the above
F) A) and C)

Question 16

The site at which replication of DNA starts in bacterial cells is known as the __________ of ___________.

Accepted Answer

The answer of The site at which replication of DNA...

Question 17

Which of the following might be missed if viable counts are done on food and/or water specimens?

Accepted Answer

A)  Endospores
B)  Aerobic bacteria
C)  Viable but nonculturable cells
D)  Pathogenic bacteriaE) None of the above
F) A) and C)

Question 18

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 choices are correct.F) A) and C)
G) All of the above

Question 19

Complex microbial communities that grow tightly adhered to surfaces are called __________.

Accepted Answer

The answer of Complex microbial communities that grow tightly adhered...

Question 20

The process of forming a cross wall between two daughter cells is known as _______________.

Accepted Answer

A)  replication
B)  septation
C)  sporulation
D)  mitosisE) None of the above
F) A) and C)

Exam 7: Microbial Growth

Quorum sensing in Gram-positive bacteria generally involves the use of ____________ as the external signaling molecules.

Correct Answer
verified

The process of segregating the daughter chromosomes in Sulfolobus is more similar to the process in eukaryotic cells than in bacterial cells.

Correct Answer
verified

Which of the following might be missed if viable counts are done on food and/or water specimens?

Correct Answer
verified

Agar is an excellent solidifying agent for microbiological media because

Correct Answer
verified

The process of forming a cross wall between two daughter cells is known as _______________.

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

Organisms that grow well at 0^$\circ$C and have optimum growth temperatures of 15^$\circ$C or lower are called

Correct Answer
verified

A microbiologist is trying to isolate a pathogen expected to be present in very small numbers from a stool specimen in which there are abundant normal microbiota.Which strategy would most likely accomplish this purpose?

Correct Answer
verified

For surface cultivation of microorganisms,a sulfated polymer called agar can be extracted from __________ and added to liquid media in order to cause it to solidify.

Correct Answer
verified

Correct Answer
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What is the result of successful communication between rhizobia and their plant hosts?

Correct Answer
verified

An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a

Correct Answer
verified

Media containing some ingredients of unknown chemical composition are called __________ media.

Correct Answer
verified

A given medium can be either selective or differential but not both.

Correct Answer
verified

Complex microbial communities that grow tightly adhered to surfaces are called __________.

Correct Answer
verified

Most microorganisms live in eutrophic environments.

Correct Answer
verified

The site at which replication of DNA starts in bacterial cells is known as the of _.

Correct Answer
verified

A growth medium that distinguishes among different groups of bacteria on the basis of their biological characteristics is called a __________ medium.

Correct Answer
verified

Microbial __________ is an increase in cell constituents that may or may not be accompanied by an increase in cell number.

Correct Answer
verified

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

Correct Answer
verified

Exam 7: Microbial Growth

Quorum sensing in Gram-positive bacteria generally involves the use of ____________ as the external signaling molecules.

Correct AnswerverifiedShow Answer

The process of segregating the daughter chromosomes in Sulfolobus is more similar to the process in eukaryotic cells than in bacterial cells.

Correct AnswerverifiedShow Answer

Which of the following might be missed if viable counts are done on food and/or water specimens?

Correct AnswerverifiedShow Answer

Agar is an excellent solidifying agent for microbiological media because

Correct AnswerverifiedShow Answer

The process of forming a cross wall between two daughter cells is known as _______________.

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

Organisms that grow well at 0 ∘\circ∘ C and have optimum growth temperatures of 15 ∘\circ∘ C or lower are called

Correct AnswerverifiedShow Answer

A microbiologist is trying to isolate a pathogen expected to be present in very small numbers from a stool specimen in which there are abundant normal microbiota.Which strategy would most likely accomplish this purpose?

Correct AnswerverifiedShow Answer

For surface cultivation of microorganisms,a sulfated polymer called agar can be extracted from __________ and added to liquid media in order to cause it to solidify.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the result of successful communication between rhizobia and their plant hosts?

Correct AnswerverifiedShow Answer

An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a

Correct AnswerverifiedShow Answer

Media containing some ingredients of unknown chemical composition are called __________ media.

Correct AnswerverifiedShow Answer

A given medium can be either selective or differential but not both.

Correct AnswerverifiedShow Answer

Complex microbial communities that grow tightly adhered to surfaces are called __________.

Correct AnswerverifiedShow Answer

Most microorganisms live in eutrophic environments.

Correct AnswerverifiedShow Answer

The site at which replication of DNA starts in bacterial cells is known as the __________ of ___________.

Correct AnswerverifiedShow Answer

A growth medium that distinguishes among different groups of bacteria on the basis of their biological characteristics is called a __________ medium.

Correct AnswerverifiedShow Answer

Microbial __________ is an increase in cell constituents that may or may not be accompanied by an increase in cell number.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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Organisms that grow well at 0^$\circ$C and have optimum growth temperatures of 15^$\circ$C or lower are called

Correct Answer
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Correct Answer
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The site at which replication of DNA starts in bacterial cells is known as the of _.

Correct Answer
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Correct Answer
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Correct Answer
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