Question 1

A bacterial culture can be kept in the log phase of growth indefinitely with the help of a/an:

Accepted Answer

A)  incubator
B)  chemostat
C)  spectrophotometer
D)  colony counter

Question 2

Which of the following statements about bacterial growth is false?

Accepted Answer

A)  Agar is used as a solidifying agent in some types of media.
B)  Bacteria growing in a liquid culture will generate colonies.
C)  A turbid culture is indicative of bacterial growth.
D)  Each bacterium plated will represent a colony-forming unit.

Question 3

All of the following are ways microorganisms adapt to limited nutrients except:

Accepted Answer

A)  synthesize increased amount of enzymes for uptake and metabolism of limited nutrients
B)  form metabolically active highly resistant endospores
C)  synthesize enzymes needed to use a different nutrient source
D)  adjust the rate at which they metabolize nutrients

Question 4

Which of the following bacterial counting techniques relies on a statistical estimate to determine the number of bacteria in a culture?

Accepted Answer

A)  Serial dilution
B)  Standard plate count
C)  Spread plate
D)  Most probable number

Question 5

Where would you expect to find a barophile?

Accepted Answer

A)  At the bottom of the ocean
B)  In unpasteurized milk
C)  In the large intestine
D)  In sewage

Question 6

A living,growing culture whose purpose is to maintain a pure culture of an organism indefinitely is a _____.

Accepted Answer

A)  colony
B)  stock culture
C)  sporulating culture
D)  broth culture

Question 7

Which of the following counting techniques does not differentiate between live and dead bacterial cells in a culture?

Accepted Answer

A)  Serial dilution
B)  Spread plate
C)  Pour plate
D)  Direct microscopic count

Question 8

Draw and label a standard growth curve. Describe each of the 4 phases. Why do you think bacteria do not continue to double indefinitely? You sample a culture that has reached the fourth phase after 2 days,can you think of one reason why the culture would begin to increase on day 4?

Accepted Answer

Growth curve should have a flat lag phas...

Question 9

Sporulation occurs in:

Accepted Answer

A)  Clostridium
B)  Staphylocoocus
C)  Klebsiella
D)  Citrobacter

Question 10

Serial dilutions are used to:

Accepted Answer

A)  slow down the growth of microbes
B)  speed up the growth of microbes
C)  obtain bacterial cultures at several different concentrations
D)  form bacterial colonies

Question 11

Organisms with special nutritional needs are said to be _____.

Accepted Answer

A)  barophiles
B)  fastidious
C)  aerobes
D)  none of the above

Question 12

Which of the following is most likely to have evolved to live in the deep layers of mud,where there is a complete lack of free oxygen?

Accepted Answer

A)  Obligate aerobe
B)  Obligate anaerobe
C)  Facultative anaerobe
D)  Aerotolerant anaerobe

Question 13

This phase decreases at a logarithmic rate.

Accepted Answer

A)  A
B)  B
C)  C
D)  D

Question 14

Most bacteria:

Accepted Answer

A)  exhibit synchronous growth under natural conditions
B)  divide when a small new cell develops from the surface of an existing cell
C)  do not immediately increase in number when placed in a culture
D)  immediately begin to divide when placed in a culture

Question 15

When a bacterial cell divides into two new cells,the new cells are called:

Accepted Answer

A)  daughter cells
B)  sister cells
C)  son cells
D)  father cells

Question 16

Most bacteria reproduce by:

Accepted Answer

A)  sexual reproduction
B)  binary fission
C)  budding
D)  homologous recombination

Question 17

Halophiles require an environment with a high concentration of ________ for optimal growth.

Accepted Answer

A)  sugar
B)  alcohol
C)  salt
D)  phosphorous

Question 18

In the stationary phase of bacterial growth:

Accepted Answer

A)  the number of newly generated cells is greater than the number of dying cells
B)  the number of newly generated cells is less than the number of dying cells
C)  the number of newly generated cells is the same as the number of dying cells
D)  none of the above

Exam 6: Growth and Culturing of Bacteria

In the stationary phase of bacterial growth:

Correct Answer
verified

Which of the following bacterial counting techniques relies on a statistical estimate to determine the number of bacteria in a culture?

Correct Answer
verified

Where would you expect to find a barophile?

Correct Answer
verified

Halophiles require an environment with a high concentration of ________ for optimal growth.

Correct Answer
verified

Which of the following counting techniques does not differentiate between live and dead bacterial cells in a culture?

Correct Answer
verified

Which of the following is most likely to have evolved to live in the deep layers of mud,where there is a complete lack of free oxygen?

Correct Answer
verified

Draw and label a standard growth curve. Describe each of the 4 phases. Why do you think bacteria do not continue to double indefinitely? You sample a culture that has reached the fourth phase after 2 days,can you think of one reason why the culture would begin to increase on day 4?

Correct Answer
verified
Growth curve should have a flat lag phas...
View Answer

All of the following are ways microorganisms adapt to limited nutrients except:

Correct Answer
verified

When a bacterial cell divides into two new cells,the new cells are called:

Correct Answer
verified

Most bacteria:

Correct Answer
verified

Most bacteria reproduce by:

Correct Answer
verified

This phase decreases at a logarithmic rate.

Correct Answer
verified

A bacterial culture can be kept in the log phase of growth indefinitely with the help of a/an:

Correct Answer
verified

Which of the following statements about bacterial growth is false?

Correct Answer
verified

Sporulation occurs in:

Correct Answer
verified

Serial dilutions are used to:

Correct Answer
verified

A living,growing culture whose purpose is to maintain a pure culture of an organism indefinitely is a _____.

Correct Answer
verified

Organisms with special nutritional needs are said to be _____.

Correct Answer
verified

Exam 6: Growth and Culturing of Bacteria

In the stationary phase of bacterial growth:

Correct AnswerverifiedShow Answer

Which of the following bacterial counting techniques relies on a statistical estimate to determine the number of bacteria in a culture?

Correct AnswerverifiedShow Answer

Where would you expect to find a barophile?

Correct AnswerverifiedShow Answer

Halophiles require an environment with a high concentration of ________ for optimal growth.

Correct AnswerverifiedShow Answer

Which of the following counting techniques does not differentiate between live and dead bacterial cells in a culture?

Correct AnswerverifiedShow Answer

Which of the following is most likely to have evolved to live in the deep layers of mud,where there is a complete lack of free oxygen?

Correct AnswerverifiedShow Answer

Draw and label a standard growth curve. Describe each of the 4 phases. Why do you think bacteria do not continue to double indefinitely? You sample a culture that has reached the fourth phase after 2 days,can you think of one reason why the culture would begin to increase on day 4?

Correct AnswerverifiedGrowth curve should have a flat lag phas...View AnswerShow Answer

All of the following are ways microorganisms adapt to limited nutrients except:

Correct AnswerverifiedShow Answer

When a bacterial cell divides into two new cells,the new cells are called:

Correct AnswerverifiedShow Answer

Most bacteria:

Correct AnswerverifiedShow Answer

Most bacteria reproduce by:

Correct AnswerverifiedShow Answer

This phase decreases at a logarithmic rate.

Correct AnswerverifiedShow Answer

A bacterial culture can be kept in the log phase of growth indefinitely with the help of a/an:

Correct AnswerverifiedShow Answer

Which of the following statements about bacterial growth is false?

Correct AnswerverifiedShow Answer

Sporulation occurs in:

Correct AnswerverifiedShow Answer

Serial dilutions are used to:

Correct AnswerverifiedShow Answer

A living,growing culture whose purpose is to maintain a pure culture of an organism indefinitely is a _____.

Correct AnswerverifiedShow Answer

Organisms with special nutritional needs are said to be _____.

Correct AnswerverifiedShow Answer

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verified
Growth curve should have a flat lag phas...
View Answer

Correct Answer
verified

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Correct Answer
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