Question 1

Why is lysogeny advantageous to a bacteriophage?

Accepted Answer

A)  It speeds up the viral infection cycle. 
B)  It enables the bacteriophage to take over the cell. 
C)  The genetic material of the bacteriophage is amplified many times over that seen in a lytic phage. 
D)  It allows the bacteriophage to infect cells it would not normally infect. 
E)  It allows the bacteriophage to destroy the host cell's DNA. 
A)  It speeds up the viral infection cycle. 
B)  It enables the bacteriophage to take over the cell. 
C)  The genetic material of the bacteriophage is amplified many times over that seen in a lytic phage. 
D)  It allows the bacteriophage to infect cells it would not normally infect. 
E)  It allows the bacteriophage to destroy the host cell's DNA.

Question 2

Which of the following is associated with the attachment of a bacteriophage to a bacterial cell?

Accepted Answer

A)  chemical attractions 
B)  random collisions 
C)  receptor specificity 
D)  both chemical attractions and receptor specificity 
E)  random collisions, chemical attractions, and receptor specificity 
A)  chemical attractions 
B)  random collisions 
C)  receptor specificity 
D)  both chemical attractions and receptor specificity 
E)  random collisions, chemical attractions, and receptor specificity

Question 3

In enveloped viruses, virus- encoded (matrix/capsomeres/envelope) proteins are required for the assembly of the envelope around the capsid.

Accepted Answer

The answer of In enveloped viruses, virus- encoded (matrix/capsomeres/envelope) proteins...

Question 4

Which of the following is matched INCORRECTLY?

Accepted Answer

A)  poliovirus; direct penetration 
B)  adenovirus; membrane fusion 
C)  measles virus; membrane fusion 
D)  herpesvirus; endocytosis 
E)  HIV; membrane fusion 
A)  poliovirus; direct penetration 
B)  adenovirus; membrane fusion 
C)  measles virus; membrane fusion 
D)  herpesvirus; endocytosis 
E)  HIV; membrane fusion

Question 5

A scientist discovers a new virus associated with a cancer. She is able to culture it in the laboratory and begins to analyze it.What features will help her determine the virus' classification? How does this help her understand the virus' mechanism for causing cancer?

Accepted Answer

Characterization of the nucleic acid pre

Question 6

Tumors invade other organs and tissues in a process called

Accepted Answer

A)  a plaque assay. 
B)  neoplasia. 
C)  latency. 
D)  budding. 
E)  metastasis. 
A)  a plaque assay. 
B)  neoplasia. 
C)  latency. 
D)  budding. 
E)  metastasis.

Question 7

Protozoa are susceptible to viral attack.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following may occur in a lysogenic infection, but not a latent one?

Accepted Answer

A)  The viral DNA integrates (inserts) into the host cell DNA. 
B)  The inserted viral DNA may leave the host DNA. 
C)  The provirus/prophage directs the synthesis of viral proteins. 
D)  The prophage/provirus is replicated with the host DNA. 
E)  The prophage/provirus alters gene expression in the host cell. 
A)  The viral DNA integrates (inserts) into the host cell DNA. 
B)  The inserted viral DNA may leave the host DNA. 
C)  The provirus/prophage directs the synthesis of viral proteins. 
D)  The prophage/provirus is replicated with the host DNA. 
E)  The prophage/provirus alters gene expression in the host cell.

Question 9

Most viruses cannot be seen by light microscopy.

Accepted Answer

A) True 
 B)False

Question 10

The process in which viral capsids are removed within the infected cell is called (entry/disassembly/uncoating).

Accepted Answer

The answer of The process in which viral capsids are...

Question 11

Compare and contrast the ways in which animal, plant, and bacterial viruses gain entry into their host cells.

Accepted Answer

Because cells have different types of ba

Question 12

One mechanism by which viruses may cause cancer is to interrupt the genetic regulatory sequences of repressor proteins. Which of the following types of viruses is most likely to be involved in causing cancer by this mechanism?

Accepted Answer

A)  +ssRNA viruses 
B)  - ssRNA viruses 
C)  retroviruses 
D)  dsRNA viruses 
E)  both +ssRNA and - ssRNA viruses 
A)  +ssRNA viruses 
B)  - ssRNA viruses 
C)  retroviruses 
D)  dsRNA viruses 
E)  both +ssRNA and - ssRNA viruses

Question 13

A(n) is a virus that infects bacterial cells.

Accepted Answer

A)  prion 
B)  nucleocapsid 
C)  envelope 
D)  virion 
E)  bacteriophage 
A)  prion 
B)  nucleocapsid 
C)  envelope 
D)  virion 
E)  bacteriophage

Question 14

All viruses use the host cell's nucleic acid polymerases for replication.

Accepted Answer

A) True 
 B)False

Question 15

Another term for a lysogenic phage is a (temperate/latent/prophage) phage.

Accepted Answer

The answer of Another term for a lysogenic phage is...

Question 16

Which of the following is a feature shared by viruses and living organisms?

Accepted Answer

A)  metabolic capability 
B)  possession of a genome that directs synthesis of materials necessary for replication 
C)  the ability to increase in size 
D)  presence of cytoplasm 
E)  responsiveness 
A)  metabolic capability 
B)  possession of a genome that directs synthesis of materials necessary for replication 
C)  the ability to increase in size 
D)  presence of cytoplasm 
E)  responsiveness

Question 17

Describe the difference between lysogeny and latency.

Accepted Answer

Lysogeny is associated with certain bact

Question 18

In contrast to most dsDNA animal viruses, the poxviruses replicate solely in the cytoplasm of the host cell. This fact implies that the viral genome may encode

Accepted Answer

A)  reverse transcriptase and RNA- dependent RNA transcriptase. 
B)  ribosome components. 
C)  RNA- dependent RNA transcriptase. 
D)  reverse transcriptase. 
E)  a DNA polymerase. 
A)  reverse transcriptase and RNA- dependent RNA transcriptase. 
B)  ribosome components. 
C)  RNA- dependent RNA transcriptase. 
D)  reverse transcriptase. 
E)  a DNA polymerase.

Question 19

Reverse transcriptase is associated with which of the following?

Accepted Answer

A)  dsRNA viruses 
B)  dsDNA viruses 
C)  +ssRNA viruses 
D)  - ssRNA viruses 
E)  retroviruses 
A)  dsRNA viruses 
B)  dsDNA viruses 
C)  +ssRNA viruses 
D)  - ssRNA viruses 
E)  retroviruses

Question 20

The viruses of fungi have RNA genomes and lack a capsid. They are therefore similar to

Accepted Answer

A)  bacteriophages. 
B)  prions. 
C)  enveloped viruses. 
D)  viroids. 
E)  lysogens. 
A)  bacteriophages. 
B)  prions. 
C)  enveloped viruses. 
D)  viroids. 
E)  lysogens.

Exam 13: Characterizing and Classifying Viruses, Viroids, and Prions

Why is lysogeny advantageous to a bacteriophage?

Which of the following is associated with the attachment of a bacteriophage to a bacterial cell?

In enveloped viruses, virus- encoded (matrix/capsomeres/envelope) proteins are required for the assembly of the envelope around the capsid.

Which of the following is matched INCORRECTLY?

A scientist discovers a new virus associated with a cancer. She is able to culture it in the laboratory and begins to analyze it.What features will help her determine the virus' classification? How does this help her understand the virus' mechanism for causing cancer?

Tumors invade other organs and tissues in a process called

Protozoa are susceptible to viral attack.

Which of the following may occur in a lysogenic infection, but not a latent one?

Most viruses cannot be seen by light microscopy.

The process in which viral capsids are removed within the infected cell is called (entry/disassembly/uncoating).

Compare and contrast the ways in which animal, plant, and bacterial viruses gain entry into their host cells.

One mechanism by which viruses may cause cancer is to interrupt the genetic regulatory sequences of repressor proteins. Which of the following types of viruses is most likely to be involved in causing cancer by this mechanism?

A(n) is a virus that infects bacterial cells.

All viruses use the host cell's nucleic acid polymerases for replication.

Another term for a lysogenic phage is a (temperate/latent/prophage) phage.

Which of the following is a feature shared by viruses and living organisms?

Describe the difference between lysogeny and latency.

In contrast to most dsDNA animal viruses, the poxviruses replicate solely in the cytoplasm of the host cell. This fact implies that the viral genome may encode

Reverse transcriptase is associated with which of the following?

The viruses of fungi have RNA genomes and lack a capsid. They are therefore similar to

A Brief History of Microbiology

The Chemistry of Microbiology

Cell Structure and Function

Microscopy, Staining, and Classification

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Controlling Microbial Growth in the Environment

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Characterizing and Classifying Prokaryotes

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Immunization and Immune Testing

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Pathogenic Gram-Positive Bacteria

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Rickettsias, Chlamydias, Spirochetes, and Vibrios

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