Question 1

Most bacteria reproduce by

Accepted Answer

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

Question 2

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 cells 
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 cells

Question 3

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)  e 
A)  a 
B)  b 
C)  c 
D)  d 
E)  e

Question 4

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

Question 5

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

Accepted Answer

A)  catalase 
B)  oxidase 
C)  peroxidase 
D)  superoxide dismutase 
A)  catalase 
B)  oxidase 
C)  peroxidase 
D)  superoxide dismutase

Question 6

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. 
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.

Question 7

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)  4 
A)  5 
B)  6 
C)  32 
D)  64 
E)  4

Question 8

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)  e 
A)  a 
B)  b 
C)  c 
D)  d 
E)  e

Question 9

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. 
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.

Question 10

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

Question 11

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. 
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.

Question 12

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)  thermophiles 
A)  hyperthermophiles 
B)  psychrophiles 
C)  facultative halophiles 
D)  anaerobes 
E)  thermophiles

Most bacteria reproduce by

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

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

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?

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

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

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

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

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

The term aerotolerant anaerobe refers to an organism that

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

The Microbial World and You

Chemical Principles

Observing Microorganisms Through a Microscope

Functional Anatomy of Prokaryotic and Eukaryotic Cells

Microbial Metabolism

The Control of Microbial Growth

Microbial Genetics

Biotechnology and Dna Technology

Classification of Microorganisms

The Prokaryotes: Domains Bacteria and Archaea

The Eukaryotes: Fungi, Algae, Protozoa, and Helminths

Viruses, Viroids, and Prions

Principles of Disease and Epidemiology

Microbial Mechanisms of Pathogenicity

Innate Immunity: Nonspecific Defenses of the Host

Adaptive Immunity: Specific Defenses of the Host

Practical Applications of Immunology

Disorders Associated With the Immune System

Antimicrobial Drugs

Microbial Diseases of the Skin and Eyes

Microbial Diseases of the Nervous System

Microbial Diseases of the Cardiovascular and Lymphatic Systems

Microbial Diseases of the Respiratory System

Microbial Diseases of the Digestive System

Microbial Disease of the Urinary and Reproductive Systems

Environmental Microbiology

Applied and Industrial Microbiology

Filters

Exam 6: Microbial Growth

Most bacteria reproduce by

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

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

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?

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

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

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

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

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

The term aerotolerant anaerobe refers to an organism that

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

The Microbial World and You

Chemical Principles

Observing Microorganisms Through a Microscope

Functional Anatomy of Prokaryotic and Eukaryotic Cells

Microbial Metabolism

The Control of Microbial Growth

Microbial Genetics

Biotechnology and Dna Technology

Classification of Microorganisms

The Prokaryotes: Domains Bacteria and Archaea

The Eukaryotes: Fungi, Algae, Protozoa, and Helminths

Viruses, Viroids, and Prions

Principles of Disease and Epidemiology

Microbial Mechanisms of Pathogenicity

Innate Immunity: Nonspecific Defenses of the Host

Adaptive Immunity: Specific Defenses of the Host

Practical Applications of Immunology

Disorders Associated With the Immune System

Antimicrobial Drugs

Microbial Diseases of the Skin and Eyes

Microbial Diseases of the Nervous System

Microbial Diseases of the Cardiovascular and Lymphatic Systems

Microbial Diseases of the Respiratory System

Microbial Diseases of the Digestive System

Microbial Disease of the Urinary and Reproductive Systems

Environmental Microbiology

Applied and Industrial Microbiology

Filters

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