Question 1

Which of the following statements about viruses is CORRECT?

Accepted Answer

Viruses are composed of both protein and lipid.

Question 2

The outermost layer of a virion primarily serves which function?

Accepted Answer

Protection

Question 3

Viruses are classified based on which of the following characteristics?

Accepted Answer

Type of host

Question 4

Host specificity of a virus is mainly due to:

Accepted Answer

Interactions between viral and cellular surface molecules.

Question 5

Which structure is primarily responsible for the shape of a virion?

Accepted Answer

The capsid

Question 6

Which of the following is CORRECT regarding the viral envelope?

Accepted Answer

It is composed of cellular phospholipid membrane, cellular and viral proteins.

Question 7

The genome of influenza virus is:

Accepted Answer

Multiple pieces of linear ssRNA.

Question 8

What is a virion?

Accepted Answer

A simple virus particle outside a cell

Question 9

Which of the following infectious particles is most susceptible to damage?

Accepted Answer

Enveloped virus

Question 10

Which of the following lists stages of a lytic replication cycle in order, from earliest to latest stages?

Accepted Answer

III. Attachment, I. Synthesis, II. Assembly

Question 11

Replication of most $dsDNA$ viruses is similar to normal cellular processes because:

Accepted Answer

They use host cell machinery for DNA replication and transcription.

Question 12

Attachment of herpesviruses results in ________, a process in which the host cell facilitates viral entry.

Accepted Answer

Membrane fusion

Question 13

Reverse transcriptase is associated with which of the following?

Accepted Answer

Retroviruses

Question 14

The genome of which of the following types of animal virus can act directly as mRNA?

Accepted Answer

$+ssRNA$ viruses

Question 15

Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated?

Accepted Answer

$-ssRNA$ viruses

Question 16

Naked capsid animal viruses are commonly released from the infected cell by ________, a process the host cell does not survive.

Accepted Answer

Lysis

Question 17

Which of the following infectious particles do NOT have protein in their structure?

Accepted Answer

Viroids

Question 18

How are prions different from all other known infectious agents?

Accepted Answer

They are composed entirely of protein.

Question 19

Disadvantages of continuous cell cultures include:

Accepted Answer

They may be significantly different genetically from the original source animal.

Question 20

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

Accepted Answer

Retroviruses

Study Guide: Viruses and Prions in Microbiology

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