Question 1

Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?

Accepted Answer

A)   hyperthermophiles
B)   psychrophiles
C)   facultative halophiles
D)   anaerobes
E)   thermophilesF) A) and E)
G) C) and E)

Question 2

Patients with indwelling catheters (long-term tubes inserted into body orifices for drainage, such as through the urethra and into the urinary bladder)  are susceptible to infections because

Accepted Answer

A)   bacteria cause infections.
B)   injected solutions are contaminated.
C)   infections can be transmitted from other people.
D)   their immune systems are weakened.
E)   biofilms develop on catheters.F) A) and B)
G) D) and E)

Question 3

The term aerotolerant anaerobe refers to an organism that

Accepted Answer

A)   tolerates normal atmospheric nitrogen gas levels.
B)   requires less oxygen than is present in air.
C)   does not use oxygen but tolerates it.
D)   is killed by oxygen.
E)   requires more oxygen than is present in air.F) A) and D)
G) A) and C)

Question 4

Most bacteria reproduce by

Accepted Answer

A)   budding.
B)   binary fission.
C)   aerial hyphae.
D)   fragmentation.
E)   mitosis.F) B) and D)
G) A) and B)

Question 5

Which of the following is an advantage of the direct microscopic count?

Accepted Answer

A)   sample volume is unknown
B)   requires no incubation time
C)   can easily distinguish live from dead cells
D)   can readily count organisms that are motile
E)   requires a large number of cellsF) None of the above
G) A) and B)

Question 6

An experiment began with 4 cells and ended with 128 cells. How many generations did the cells go through?

Accepted Answer

A)   5
B)   6
C)   32
D)   64
E)   4F) C) and E)
G) All of the above

Question 7

Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This type of medium would be referred to as a(n)

Accepted Answer

A)   selective and differential medium.
B)   differential medium.
C)   selective medium.
D)   enrichment culture.
E)   differential and enrichment culture.F) A) and D)
G) B) and E)

Question 8

Assume you inoculated 100 cells, with a generation time of 20 minutes, into 100 ml of nutrient broth. You then inoculated 100 cells of the same species into 200 ml of nutrient broth. After incubation for 4 hours, you can reasonably expect to have

Accepted Answer

A)   more cells in the 100 ml.
B)   more cells in the 200 ml.
C)   the same number of cells in both.
D)   The answer cannot be determined based on the information provided.E) All of the above
F) B) and D)

Question 9

Which enzyme catalyzes the reaction: H2o2 + 2H+ → 2H2O?

Accepted Answer

A)   catalase
B)   oxidase
C)   peroxidase
D)   superoxide dismutaseE) A) and B)
F) C) and D)

Question 10

Figure 6.3
 
-In Figure 6.3, which tube shows the expected growth pattern for a microaerophile?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   eF) A) and E)
G) C) and D)

Question 11

Figure 6.2
 
-Figure 6.2 shows a typical bacterial growth curve with the y-axis indicating the log of the number of bacteria and the x-axis indicating time in culture. In the figure, which sections of the graph illustrate a logarithmic change in cell numbers?

Accepted Answer

A)   a and b
B)   a and d
C)   c and d
D)   b and d
E)   a and cF) D) and E)
G) B) and E)

Question 12

Figure 6.3
 
-In Figure 6.3, which tube shows the expected growth pattern for a facultative anaerobe?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   eF) B) and D)
G) C) and D)

Exam 6: Microbial Growth

Assume you inoculated 100 cells, with a generation time of 20 minutes, into 100 ml of nutrient broth. You then inoculated 100 cells of the same species into 200 ml of nutrient broth. After incubation for 4 hours, you can reasonably expect to have

Correct Answer
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Correct Answer
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Which of the following is an advantage of the direct microscopic count?

Correct Answer
verified

Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?

Correct Answer
verified

An experiment began with 4 cells and ended with 128 cells. How many generations did the cells go through?

Correct Answer
verified

Figure 6.3 -In Figure 6.3, which tube shows the expected growth pattern for a microaerophile?

Correct Answer
verified

Figure 6.3 -In Figure 6.3, which tube shows the expected growth pattern for a facultative anaerobe?

Correct Answer
verified

Which enzyme catalyzes the reaction: H₂o₂ + 2H+ → 2H₂O?

Correct Answer
verified

Patients with indwelling catheters (long-term tubes inserted into body orifices for drainage, such as through the urethra and into the urinary bladder) are susceptible to infections because

Correct Answer
verified

The term aerotolerant anaerobe refers to an organism that

Correct Answer
verified

Most bacteria reproduce by

Correct Answer
verified

Figure 6.2 -Figure 6.2 shows a typical bacterial growth curve with the y-axis indicating the log of the number of bacteria and the x-axis indicating time in culture. In the figure, which sections of the graph illustrate a logarithmic change in cell numbers?

Correct Answer
verified

Exam 6: Microbial Growth

Assume you inoculated 100 cells, with a generation time of 20 minutes, into 100 ml of nutrient broth. You then inoculated 100 cells of the same species into 200 ml of nutrient broth. After incubation for 4 hours, you can reasonably expect to have

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is an advantage of the direct microscopic count?

Correct AnswerverifiedShow Answer

Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?

Correct AnswerverifiedShow Answer

An experiment began with 4 cells and ended with 128 cells. How many generations did the cells go through?

Correct AnswerverifiedShow Answer

Figure 6.3 -In Figure 6.3, which tube shows the expected growth pattern for a microaerophile?

Correct AnswerverifiedShow Answer

Figure 6.3 -In Figure 6.3, which tube shows the expected growth pattern for a facultative anaerobe?

Correct AnswerverifiedShow Answer

Which enzyme catalyzes the reaction: H2o2 + 2H+ → 2H2O?

Correct AnswerverifiedShow Answer

Patients with indwelling catheters (long-term tubes inserted into body orifices for drainage, such as through the urethra and into the urinary bladder) are susceptible to infections because

Correct AnswerverifiedShow Answer

The term aerotolerant anaerobe refers to an organism that

Correct AnswerverifiedShow Answer

Most bacteria reproduce by

Correct AnswerverifiedShow Answer

Figure 6.2 -Figure 6.2 shows a typical bacterial growth curve with the y-axis indicating the log of the number of bacteria and the x-axis indicating time in culture. In the figure, which sections of the graph illustrate a logarithmic change in cell numbers?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which enzyme catalyzes the reaction: H₂o₂ + 2H+ → 2H₂O?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified