Question 1

A filamentous phage is incapable of causing a lytic infection.

Accepted Answer

A) True 
 B)False

Question 2

All bacteriophages must be able to:
1) inject their DNA into the host cell
2) cause a genetic change in the host cell
3) kill the host cell
4) replicate in the absence of a host
5) exit a host cell by extrusion

Accepted Answer

A)  1, 2, and 4 
B)  2 and 3 
C)  1, 4, and 5 
D)  2 only 
E)  1 only 
A)  1, 2, and 4 
B)  2 and 3 
C)  1, 4, and 5 
D)  2 only 
E)  1 only

Question 3

Resistance of some animals to certain viral diseases is based on

Accepted Answer

A)  lack of spikes for attachment. 
B)  lack of specific receptors on the host cell. 
C)  phagocytosis of the virus by the host cell. 
D)  the presence of the viral envelope. 
E)  immunity in the host cell. 
A)  lack of spikes for attachment. 
B)  lack of specific receptors on the host cell. 
C)  phagocytosis of the virus by the host cell. 
D)  the presence of the viral envelope. 
E)  immunity in the host cell.

Question 4

The approximate viral concentration of a sample may be determined by

Accepted Answer

A)  quantal assay. 
B)  endpoint assay. 
C)  the titer. 
D)  the lysate assay. 
E)  cytopathic assay. 
A)  quantal assay. 
B)  endpoint assay. 
C)  the titer. 
D)  the lysate assay. 
E)  cytopathic assay.

Question 5

In latent infections, the virions are

Accepted Answer

A)  constantly produced. 
B)  only produced during reactivation. 
C)  produced very slowly. 
D)  continually being slowly budded out. 
E)  always detectable in the infected person. 
A)  constantly produced. 
B)  only produced during reactivation. 
C)  produced very slowly. 
D)  continually being slowly budded out. 
E)  always detectable in the infected person.

Question 6

During penetration of E. coli by the T4 phage,

Accepted Answer

A)  lysozyme is used to allow entry of the phage capsid. 
B)  the tail acts as a "hypodermic needle," injecting the phage DNA into the cell. 
C)  the protein fibers digest a hole in the cell wall. 
D)  the bacterial receptor molecules open a hole through the cell wall. 
E)  the intact phage enters the host by endocytosis. 
A)  lysozyme is used to allow entry of the phage capsid. 
B)  the tail acts as a "hypodermic needle," injecting the phage DNA into the cell. 
C)  the protein fibers digest a hole in the cell wall. 
D)  the bacterial receptor molecules open a hole through the cell wall. 
E)  the intact phage enters the host by endocytosis.

Question 7

Phages that can either replicate and cause cell lysis or can integrate their DNA into the host DNA are called

Accepted Answer

A)  temperate phages. 
B)  lytic phages. 
C)  virulent phages. 
D)  segmented phages. 
E)  bacteriophages. 
A)  temperate phages. 
B)  lytic phages. 
C)  virulent phages. 
D)  segmented phages. 
E)  bacteriophages.

Question 8

An infection in which the virus is continually present in the body is referred to as

Accepted Answer

A)  acute. 
B)  balanced. 
C)  determinant. 
D)  persistent. 
E)  fatal. 
A)  acute. 
B)  balanced. 
C)  determinant. 
D)  persistent. 
E)  fatal.

Question 9

Which is true of lysogenized cells?

Accepted Answer

A)  They are immune to any further infection by any virus. 
B)  They are immune to infection by the same virus. 
C)  They may have new properties AND they respond to infection with the SOS response. 
D)  They respond to infection with the SOS response. 
E)  They are immune to infection by the same virus AND may have new properties. 
A)  They are immune to any further infection by any virus. 
B)  They are immune to infection by the same virus. 
C)  They may have new properties AND they respond to infection with the SOS response. 
D)  They respond to infection with the SOS response. 
E)  They are immune to infection by the same virus AND may have new properties.

Question 10

The signs and symptoms of cholera are caused by cholera toxin that is synthesized and secreted by the bacteria. The toxin causes chloride and other electrolytes to leave the intestinal cells. Water follows the electrolytes, resulting in an outpouring of water into the intestinal lumen. The gene for cholera toxin is a bacteriophage gene. This situation is an example of ________.

Accepted Answer

A)  lysogenic conversion 
B)  DNA-mediated transformation 
C)  mutation 
D)  vertical gene transfer 
E)  indirect selection 
A)  lysogenic conversion 
B)  DNA-mediated transformation 
C)  mutation 
D)  vertical gene transfer 
E)  indirect selection

Question 11

If the infecting phage lacks some critical pieces of DNA necessary for replication, it is called

Accepted Answer

A)  incomplete. 
B)  mutated. 
C)  defective. 
D)  vegetative. 
E)  carcinogenic. 
A)  incomplete. 
B)  mutated. 
C)  defective. 
D)  vegetative. 
E)  carcinogenic.

Question 12

If reasonably pure preparations of virus are available, the number of virus present may be determined by

Accepted Answer

A)  photocolorimetry. 
B)  electron microscopy. 
C)  gas chromatography. 
D)  light microscopy. 
E)  spectrophotometry. 
A)  photocolorimetry. 
B)  electron microscopy. 
C)  gas chromatography. 
D)  light microscopy. 
E)  spectrophotometry.

Question 13

The filamentous phages all contain

Accepted Answer

A)  single-stranded DNA. 
B)  double-stranded DNA. 
C)  single-stranded RNA. 
D)  double-stranded RNA. 
E)  single-stranded RNA, OR single-stranded DNA. 
A)  single-stranded DNA. 
B)  double-stranded DNA. 
C)  single-stranded RNA. 
D)  double-stranded RNA. 
E)  single-stranded RNA, OR single-stranded DNA.

Question 14

Virulent as well as temperate phages can serve as generalized transducing phages.

Accepted Answer

A) True 
 B)False

Exam 13: Viruses, Viroids, and Prions

A filamentous phage is incapable of causing a lytic infection.

All bacteriophages must be able to: 1) inject their DNA into the host cell 2) cause a genetic change in the host cell 3) kill the host cell 4) replicate in the absence of a host 5) exit a host cell by extrusion

Resistance of some animals to certain viral diseases is based on

The approximate viral concentration of a sample may be determined by

In latent infections, the virions are

During penetration of E. coli by the T4 phage,

Phages that can either replicate and cause cell lysis or can integrate their DNA into the host DNA are called

An infection in which the virus is continually present in the body is referred to as

Which is true of lysogenized cells?

If the infecting phage lacks some critical pieces of DNA necessary for replication, it is called

If reasonably pure preparations of virus are available, the number of virus present may be determined by

The filamentous phages all contain

Virulent as well as temperate phages can serve as generalized transducing phages.

Humans and the Microbial World

The Molecules of Life

Microscopy and Cell Structure

Dynamics of Microbial Growth

Control of Microbial Growth

Microbial Metabolism: Fueling Cell Growth

The Blueprint of Life, From Dna to Protein

Bacterial Genetics

Biotechnology

Identifying and Classifying Microorganisms

The Diversity of Bacteria and Archaea

The Eukaryotic Members of the Microbial World

The Innate Immune Response

The Adaptive Immune Response

Host-Microbe Interactions

Immunological Disorders

Applications of Immune Responses

Epidemiology

Antimicrobial Medications

Respiratory System Infections

Skin Infections

Wound Infections

Digestive System Infections

Blood and Lymphatic Infections

Nervous System Infections

Genitourinary Tract Infections

Microbial Ecology

Environmental Microbiology: Treatment of Water, Wastes, and Polluted Habitats

Food Microbiology

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