Question 1

A clinical sample of (urine/sputum/tissue) is called a biopsy.

Accepted Answer

The answer of A clinical sample of (urine/sputum/tissue) is called...

Question 2

Which of the following explains why honey can be stored at room temperature for years without spoiling?

Accepted Answer

A)   hydrostatic pressure
B)   osmotic pressure
C)   low pH
D)   lyophilization
E)   anaerobic conditions

Question 3

A microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n)

Accepted Answer

A)   obligate anaerobe.
B)   microaerophile.
C)   obligate aerobe.
D)   aerotolerant anaerobe.
E)   facultative anaerobe.

Question 4

A microorganism found living under conditions of high is a barophile.

Accepted Answer

A)   salt concentrations
B)   oxygen concentrations
C)   hydrostatic pressure
D)   carbon dioxide levels
E)   pH values

Question 5

The conversion of nitrogen gas to ammonia is called nitrogen (metabolism/fixation).

Accepted Answer

The answer of The conversion of nitrogen gas to ammonia...

Question 6

An obligate anaerobe can be cultured in a candle jar.

Accepted Answer

A) True 
 B)False

Question 7

Biofilms are the natural state for the majority of bacteria in nature.

Accepted Answer

A) True 
 B)False

Question 8

Reactions catalyzed by superoxide dismutases can produce the (hydroxyl/peroxide/superoxide) radical.

Accepted Answer

The answer of Reactions catalyzed by superoxide dismutases can produce...

Question 9

Obligate anaerobes may be cultured in the laboratory

Accepted Answer

A)   in standard complex media.
B)   in standard Petri plates.
C)   in a standard incubator.
D)   in a reducing medium.
E)   on blood agar plates.

Question 10

Thermoduric mesophiles are often responsible for spoilage of improperly canned foods.

Accepted Answer

A) True 
 B)False

Question 11

Bacteria living in communities of microbes change the genes they are expressing in response to

Accepted Answer

A)   decreasing oxygen.
B)   changes in local temperature.
C)   changes in hydrostatic pressure.
D)   quorum-sensing molecules.
E)   changes in pH.

Question 12

An aquatic microbe that can grow only near the surface of the water is probably which of the following?

Accepted Answer

A)   a chemotroph
B)   a lithotroph
C)   a heterotroph
D)   a phototroph
E)   an anaerobe

Question 13

Organisms that can grow with or without oxygen present are

Accepted Answer

A)   aerotolerant anaerobes.
B)   obligate anaerobes.
C)   facultative anaerobes.
D)   obligate aerobes.
E)   either facultative anaerobes or aerotolerant anaerobes.

Question 14

You open a jar that has been in the refrigerator for a couple of weeks and find the contents do not look or smell right. What type of microbe has been growing in your refrigerator?

Accepted Answer

A)   hyperthermophile
B)   thermoduric
C)   thermophile
D)   mesophile
E)   psychrophile

Question 15

At temperatures higher than the maximum growth temperature for an organism,

Accepted Answer

A)   proteins are permanently denatured.
B)   hydrogen bonds are broken and proteins are permanently denatured.
C)   membranes become too fluid for proper function.
D)   hydrogen bonds are broken, proteins are denatured, and membranes become too fluid.
E)   hydrogen bonds within molecules are broken.

Question 16

Agar is a useful compound in the microbiology lab because it is an excellent nutrient for bacteria.

Accepted Answer

A) True 
 B)False

Question 17

The generation time of a bacterial culture is determined by the culture conditions.

Accepted Answer

A) True 
 B)False

Question 18

Halophiles are found living in high conditions.

Accepted Answer

A)   salt concentration
B)   oxygen levels
C)   pH
D)   hydrostatic pressure
E)   carbon dioxide

Question 19

Which of the following quantification techniques can distinguish living cells from dead cells in a culture?

Accepted Answer

A)   microscopic counts
B)   a Coulter counter
C)   turbidity
D)   dry weight
E)   metabolic activity

Question 20

An epidemiologist is investigating a new disease and observes what appear to be bacteria inside tissue cells in clinical samples from victims. The scientist wants to try to isolate the bacteria in the lab. What culture conditions are most likely to be successful?

Accepted Answer

A)   culturing on blood agar plates
B)   incubation in an anaerobic culture system
C)   inoculation of EMB plates
D)   inoculation of a minimal medium broth
E)   inoculation of cell cultures

Exam 6: Microbial Nutrition and Growth

Organisms that can grow with or without oxygen present are

Correct AnswerverifiedShow Answer

A clinical sample of (urine/sputum/tissue) is called a biopsy.

Correct AnswerverifiedShow Answer

Obligate anaerobes may be cultured in the laboratory

Correct AnswerverifiedShow Answer

Reactions catalyzed by superoxide dismutases can produce the (hydroxyl/peroxide/superoxide) radical.

Correct AnswerverifiedShow Answer

Bacteria living in communities of microbes change the genes they are expressing in response to

Correct AnswerverifiedShow Answer

The conversion of nitrogen gas to ammonia is called nitrogen (metabolism/fixation).

Correct AnswerverifiedShow Answer

Which of the following quantification techniques can distinguish living cells from dead cells in a culture?

Correct AnswerverifiedShow Answer

A microorganism found living under conditions of high is a barophile.

Correct AnswerverifiedShow Answer

An aquatic microbe that can grow only near the surface of the water is probably which of the following?

Correct AnswerverifiedShow Answer

Thermoduric mesophiles are often responsible for spoilage of improperly canned foods.

Correct AnswerverifiedShow Answer

An obligate anaerobe can be cultured in a candle jar.

Correct AnswerverifiedShow Answer

Agar is a useful compound in the microbiology lab because it is an excellent nutrient for bacteria.

Correct AnswerverifiedShow Answer

At temperatures higher than the maximum growth temperature for an organism,

Correct AnswerverifiedShow Answer

The generation time of a bacterial culture is determined by the culture conditions.

Correct AnswerverifiedShow Answer

A microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n)

Correct AnswerverifiedShow Answer

You open a jar that has been in the refrigerator for a couple of weeks and find the contents do not look or smell right. What type of microbe has been growing in your refrigerator?

Correct AnswerverifiedShow Answer

An epidemiologist is investigating a new disease and observes what appear to be bacteria inside tissue cells in clinical samples from victims. The scientist wants to try to isolate the bacteria in the lab. What culture conditions are most likely to be successful?

Correct AnswerverifiedShow Answer

Halophiles are found living in high conditions.

Correct AnswerverifiedShow Answer

Biofilms are the natural state for the majority of bacteria in nature.

Correct AnswerverifiedShow Answer

Which of the following explains why honey can be stored at room temperature for years without spoiling?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified