Question 1

Performing a standard plate count experiment for Bacillus cereus would allow a microbiologist to ________.

Accepted Answer

A)   generate a population growth curve for that particular organism
B)   generate a population growth curve for any organism
C)   calculate the number of cells in the initial inoculum
D)   count the number of cells per colonyE) None of the above
F) A) and D)

Question 2

A Coulter counter can count viable cells as well as determine the size.

Accepted Answer

A) True 
 B)False

Question 3

Facilitated diffusion is limited by ________.

Accepted Answer

A)   substrate concentration
B)   carrier proteins in the membrane
C)   size of the pores in the membrane
D)   osmotic pressure
E)   the size of the cellF) A) and B)
G) All of the above

Question 4

The degree of turbidity in a culture correlates to the amount of cell growth.

Accepted Answer

A) True 
 B)False

Question 5

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)   endocytosisF) B) and C)
G) B) and E)

Question 6

Archaea, as a group, are not pathogens. This is because ________.

Accepted Answer

A)   they evolved without mammals
B)   mammals evolved special defenses against them
C)   mammalian hosts do not meet their environmental requirements
D)   they are outcompeted by natural flora
E)   None of the choices are correctF) A) and E)
G) C) and D) C

Question 7

When microbes are in a close nutritional relationship, and one benefits but the other is not harmed, it is called ________.

Accepted Answer

A)   symbiosis
B)   satellitism
C)   commensalism
D)   mutualism
E)   synergismF) A) and D)
G) A) and C)

Question 8

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Accepted Answer

A) True 
 B)False

Question 9

Calcium is required for bacteria because it ________.

Accepted Answer

A)   stabilizes the cell wall
B)   stabilizes the ribosomes
C)   stabilizes the nucleoid
D)   maintains cellular pH
E)   makes strong bonesF) None of the above
G) C) and E)

Question 10

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 sourceF) C) and D)
G) A) and E)

Question 11

An organism that cannot tolerate an oxygen environment is a(n)  ________.

Accepted Answer

A)   aerotolerant anaerobe
B)   obligate aerobe
C)   facultative anaerobe
D)   microaerophile
E)   obligate anaerobeF) B) and E)
G) All of the above

Question 12

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

Accepted Answer

A)   Blood agar
B)   Thioglycollate
C)   Sulfite polymyxin sulfadiazine
D)   Sodium chloride
E)   None of the choices are correct.F) B) and E)
G) None of the above

Question 13

The term obligate refers to ________.

Accepted Answer

A)   the ability to exist in a wide range of conditions
B)   existing in a very narrow niche
C)   using chemicals for energy production
D)   using light for energy production
E)   using oxygen for metabolismF) A) and D)
G) A) and C)

Question 14

When microbes live independently but cooperate and share nutrients, it is called ________.

Accepted Answer

A)   symbiosis
B)   satellitism
C)   antibiosis
D)   mutualism
E)   synergismF) B) and C)
G) A) and E)

Question 15

An organism that cannot grow without oxygen is a(n)  ________.

Accepted Answer

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

Question 16

Organisms that feed on dead organisms for nutrients are called ________.

Accepted Answer

A)   saprobes
B)   parasites
C)   autotrophs
D)   lithoautotrophs
E)   phototrophsF) B) and C)
G) All of the above

Question 17

Bacterial biofilms stimulate the immune system differently than free (planktonic) bacteria.

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A)   be in a hypotonic solution
B)   gain water
C)   be in an isotonic solution
D)   shrivel
E)   None of the choices are correct.F) None of the above
G) B) and E) D

Question 19

The RN educates the staff about the importance of timely symptom recognition and treatment of the infection. Which of the following statements by a hospital provider demonstrates a proper understanding of antimicrobial agents?

Accepted Answer

A)   It is most effective to treat patients with antimicrobials in the lag phase of bacterial growth.
B)   It is most effective to treat patients with antimicrobials in the exponential growth phase.
C)   It is most effective to treat patients with antimicrobials during the stationary growth phase.
D)   It is most effective to treat patients with antimicrobials during the death phase of bacterial growth.E) B) and C)
F) A) and B) B

Question 20

A halophile would grow best in ________.

Accepted Answer

A)   acid pools
B)   freshwater ponds
C)   hot geyser springs
D)   arid, desert soil
E)   salt lakesF) A) and C)
G) C) and D)

Exam 6: Microbial Nutrition and Growth

Performing a standard plate count experiment for Bacillus cereus would allow a microbiologist to ________.

Correct AnswerverifiedShow Answer

A Coulter counter can count viable cells as well as determine the size.

Correct AnswerverifiedShow Answer

Facilitated diffusion is limited by ________.

Correct AnswerverifiedShow Answer

The degree of turbidity in a culture correlates to the amount of cell growth.

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

Archaea, as a group, are not pathogens. This is because ________.

Correct AnswerverifiedC

When microbes are in a close nutritional relationship, and one benefits but the other is not harmed, it is called ________.

Correct AnswerverifiedShow Answer

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Correct AnswerverifiedShow Answer

Calcium is required for bacteria because it ________.

Correct AnswerverifiedShow Answer

The term autotroph refers to an organism that ________.

Correct AnswerverifiedShow Answer

An organism that cannot tolerate an oxygen environment is a(n) ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The term obligate refers to ________.

Correct AnswerverifiedShow Answer

When microbes live independently but cooperate and share nutrients, it is called ________.

Correct AnswerverifiedShow Answer

An organism that cannot grow without oxygen is a(n) ________.

Correct AnswerverifiedShow Answer

Organisms that feed on dead organisms for nutrients are called ________.

Correct AnswerverifiedShow Answer

Bacterial biofilms stimulate the immune system differently than free (planktonic) bacteria.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

The RN educates the staff about the importance of timely symptom recognition and treatment of the infection. Which of the following statements by a hospital provider demonstrates a proper understanding of antimicrobial agents?

Correct AnswerverifiedB

A halophile would grow best in ________.

Correct AnswerverifiedShow Answer

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C

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D

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B

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