Question 1

Viruses are the only known infectious agents that are obligatory intracellular parasites.

Accepted Answer

A) True 
 B)False

Question 2

An infectious protein is a

Accepted Answer

A)   bacteriophage.
B)   prion.
C)   papovavirus.
D)   viroid.
E)   retrovirus.

Question 3

Most RNA viruses carry which of the following enzymes?

Accepted Answer

A)   reverse transcriptase
B)   lysozyme
C)   ATP synthase
D)   RNA-dependent RNA polymerase
E)   DNA-dependent DNA polymerase

Question 4

The definition of lysogeny is

Accepted Answer

A)   the period during replication when virions are not present.
B)   when the burst time takes an unusually long time.
C)   attachment of a phage to a cell.
D)   lysis of the host cell due to a phage.
E)   phage DNA is incorporated into host cell DNA.

Question 5

Generally, in an infection caused by a DNA-containing virus, the host animal cell supplies all of the following EXCEPT

Accepted Answer

A)   nucleotides.
B)   DNA polymerase.
C)   RNA polymerase.
D)   tRNA.
E)   None of the answers are correct; all of these are supplied by the host animal cell.

Question 6

Which of the following statements about viral spikes is FALSE?

Accepted Answer

A)   They bind to receptors on the host cell surface.
B)   They are composed of carbohydrate-protein complexes.
C)   They may cause hemagglutination.
D)   They are found only on nonenveloped viruses.
E)   They are used for attachment.

Question 7

DNA made from an RNA template will be incorporated into the virus capsid of

Accepted Answer

A)   Hepadnaviridae.
B)   influenzavirus.
C)   bacteriophage families.
D)   Herpesviridae.
E)   Retroviridae.

Question 8

An envelope is acquired during which of the following steps?

Accepted Answer

A)   penetration
B)   adsorption
C)   release
D)   biosynthesis
E)   uncoating

Question 9

The following steps occur during biosynthesis of a + strand RNA virus. What is the third step?

Accepted Answer

A)   synthesis of viral proteins
B)   synthesis of + strand RNA
C)   penetration and uncoating
D)   synthesis of - strand RNA
E)   attachment

Question 10

Which of the following statements about viruses is FALSE?

Accepted Answer

A)   Viruses contain DNA or RNA but never both.
B)   Viruses contain a protein coat.
C)   Viruses have genes.
D)   Viruses use their own catabolic enzymes.
E)   Viruses use the anabolic machinery of the cell.

Question 11

Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals?

Accepted Answer

A)   They are chemically simple.
B)   They are filterable.
C)   They cause diseases similar to those caused by chemicals.
D)   They cannot reproduce themselves outside a host.
E)   They are not composed of cells.

Question 12

Which of the following is NOT utilized to culture viruses?

Accepted Answer

A)   animal cell cultures
B)   culture media
C)   embryonated eggs
D)   laboratory animals
E)   bacterial cultures

Question 13

Which of the following statements is FALSE?

Accepted Answer

A)   A prophage is phage DNA inserted into a bacterial chromosome.
B)   A prophage may result in new properties of the host cell.
C)   Prophage genes are repressed by a repressor protein coded for by the prophage.
D)   A prophage can ʺpopʺ out of the chromosome.
E)   The prophage makes the host cell immune to infection by other phages.

Question 14

were first identified in cancer-causing viruses and can induce in infected cells.

Accepted Answer

A)   Oncogenes; transformation
B)   Segmented genomes; reassortment
C)   T antigens; lysis
D)   Glycoprotein spikes; syncytia formation
E)   Herpes viruses; lesions

Question 15

Which of the following is NOT used as a criterion to classify viruses?

Accepted Answer

A)   morphology
B)   size
C)   number of capsomeres
D)   biochemical tests
E)   nucleic acid

Question 16

Viruses that utilize reverse transcriptase belong to the virus families

Accepted Answer

A)   Rhabdoviridae and Herpesviridae.
B)   Herpesviridae and Retroviridae.
C)   Hepadnaviridae and Retroviridae.
D)   Retroviridae and Picornaviridae.
E)   Herpesviridae and Poxviridae.

Question 17

Bacteriophage replication differs from animal virus replication because only bacteriophage replication involves

Accepted Answer

A)   assembly of viral components.
B)   replication of viral nucleic acid.
C)   adsorption to specific receptors.
D)   injection of naked nucleic acid into the host cell.
E)   lysis of the host cell.

Question 18

Which one of the following steps does NOT occur during multiplication of a picornavirus?

Accepted Answer

A)   synthesis of DNA
B)   synthesis of - strands of RNA
C)   synthesis of viral proteins
D)   synthesis of + strands of RNA
E)   None of the answers is correct.

Question 19

The following steps occur during multiplication of retroviruses. Which is the fourth step?

Accepted Answer

A)   penetration
B)   uncoating
C)   attachment
D)   synthesis of double-stranded DNA
E)   synthesis of +RNA

Question 20

A clear area against a confluent ʺlawnʺ of bacteria is called a

Accepted Answer

A)   cell lysis.
B)   rash.
C)   plaque.
D)   pock.
E)   phage.

Exam 13: Viruses, Viroids, and Prions

DNA made from an RNA template will be incorporated into the virus capsid of

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The following steps occur during multiplication of retroviruses. Which is the fourth step?

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An envelope is acquired during which of the following steps?

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Which of the following statements about viral spikes is FALSE?

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Which of the following is NOT used as a criterion to classify viruses?

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Most RNA viruses carry which of the following enzymes?

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Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals?

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Which one of the following steps does NOT occur during multiplication of a picornavirus?

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Viruses that utilize reverse transcriptase belong to the virus families

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The definition of lysogeny is

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were first identified in cancer-causing viruses and can induce in infected cells.

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Bacteriophage replication differs from animal virus replication because only bacteriophage replication involves

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A clear area against a confluent ʺlawnʺ of bacteria is called a

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Viruses are the only known infectious agents that are obligatory intracellular parasites.

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The following steps occur during biosynthesis of a + strand RNA virus. What is the third step?

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Which of the following statements about viruses is FALSE?

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Which of the following statements is FALSE?

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Which of the following is NOT utilized to culture viruses?

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An infectious protein is a

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Generally, in an infection caused by a DNA-containing virus, the host animal cell supplies all of the following EXCEPT

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