Question 1

An oncogenic RNA virus must have which of the following enzymes?

Accepted Answer

A)   Lysozyme
B)   Reverse transcriptase
C)   RNA polymerase
D)   DNA- dependent DNA polymerase
E)   All of the aboveF) None of the above
G) D) and E)

Question 2

Which of the following is not true about spikes?

Accepted Answer

A)   They may cause hemagglutination.
B)   They are only found on enveloped viruses.
C)   They are used for penetration.
D)   They are used for absorption.
E)   None of the above.F) None of the above
G) D) and E) C

Question 3

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

Accepted Answer

A)   Synthesis of - strand RNA
B)   Synthesis of viral proteins
C)   Penetration and uncoating
D)   Attachment
E)   Synthesis of + strand RNAF) A) and B)
G) A) and C)

Question 4

The most common route of accidental AIDS transmission to health- care workers is

Accepted Answer

A)   Environmental surface contact.
B)   Mouth to mouth.
C)   Fecal- oral.
D)   Aerosol.
E)   Needlestick.F) A) and E)
G) None of the above

Question 5

The following steps occur during multiplication of Herpesviruses. What is the third step?

Accepted Answer

A)   Biosynthesis
B)   Uncoating
C)   Release
D)   Attachment
E)   PenetrationF) A) and B)
G) A) and C) B

Question 6

The most conclusive evidence that viruses cause cancers is provided by

Accepted Answer

A)   Finding oncogenes in viruses.
B)   Treating cancer with antibodies.
C)   Some liver cancer patients having had hepatitis.
D)   Cancer following injection of cell- free filtrates.
E)   The presence of antibodies against viruses in cancer patients.F) C) and E)
G) C) and D)

Question 7

An infectious protein is a

Accepted Answer

A)   Retrovirus
B)   Prion
C)   Viroid
D)   Bacteriophage
E)   None of the aboveF) B) and D)
G) A) and E)

Question 8

A viral species is a group of viruses that

Accepted Answer

A)   Have the same genetic information and ecological niche.
B)   Have the same morphology and nucleic acid.
C)   Infect the same cells and cause the same disease.
D)   Can't be defined.E) None of the above
F) All of the above

Question 9

Most RNA viruses carry which of the following enzymes?

Accepted Answer

A)   Lysozyme
B)   DNA- dependent DNA polymerase
C)   ATP synthase
D)   Reverse transcriptase
E)   RNA- dependent RNA polymeraseF) A) and B)
G) A) and C)

Question 10

Which of the following is most likely a product of an early gene?

Accepted Answer

A)   Capsid proteins
B)   Envelope proteins
C)   Spike proteins
D)   Lysozyme
E)   DNA polymeraseF) All of the above
G) A) and B)

Question 11

Assume you have isolated an unknown virus. It is a single- stranded RNA, enveloped virus. To which group does it most likely belong?

Accepted Answer

A)   Herpesvirus
B)   Picornavirus
C)   Togavirus
D)   Retrovirus
E)   None of the aboveF) A) and D)
G) All of the above

Question 12

The definition of lysogeny is

Accepted Answer

A)   Lysis of the host cell due to a phage.
B)   Phage DNA is incorporated into host cell DNA.
C)   When the burst time takes an unusually long time.
D)   The period during replication when virions are not present.
E)   None of the above.F) A) and C)
G) D) and E)

Question 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

A)   Size
B)   Number of capsomeres
C)   Morphology
D)   Nucleic acid
E)   Biochemical testsF) All of the above
G) A) and E)

Question 15

Bacteriophages and animal viruses do not differ significantly in which one of the following steps?

Accepted Answer

A)   Adsorption
B)   Penetration
C)   Biosynthesis
D)   Release
E)   UncoatingF) B) and E)
G) A) and C)

Question 16

Latent viruses are present in cells as

Accepted Answer

A)   Enzymes.
B)   Capsids.
C)   Proviruses.
D)   Prophages.
E)   None of the above.F) B) and D)
G) C) and D) C

Question 17

Which of the following is not a method of culturing viruses?

Accepted Answer

A)   In embryonated eggs
B)   In laboratory animals
C)   In cell culture
D)   In culture media
E)   None of the aboveF) A) and D)
G) C) and D)

Question 18

Generalized transduction differs from specialized transduction in that generalized transduction

Accepted Answer

A)   Transfers specific DNA.
B)   Involves lysogeny.
C)   Kills the host.
D)   Transfers DNA from one cell to another.
E)   None of the above.F) A) and E)
G) All of the above

Question 19

Figure 13.1
 
-In Figure 13.1, which of these is a complex virus?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   All of the aboveF) None of the above
G) B) and E)

Question 20

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

Accepted Answer

A)   Influenzavirus.
B)   Retroviridae.
C)   Bacteriophage families.
D)   Hepadnaviridae.
E)   Herpesviridae.F) A) and B)
G) B) and E)

Exam 13: Viruses, Viroids, and Prions

An oncogenic RNA virus must have which of the following enzymes?

Correct AnswerverifiedShow Answer

Which of the following is not true about spikes?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

The most common route of accidental AIDS transmission to health- care workers is

Correct AnswerverifiedShow Answer

The following steps occur during multiplication of Herpesviruses. What is the third step?

Correct AnswerverifiedB

The most conclusive evidence that viruses cause cancers is provided by

Correct AnswerverifiedShow Answer

An infectious protein is a

Correct AnswerverifiedShow Answer

A viral species is a group of viruses that

Correct AnswerverifiedShow Answer

Most RNA viruses carry which of the following enzymes?

Correct AnswerverifiedShow Answer

Which of the following is most likely a product of an early gene?

Correct AnswerverifiedShow Answer

Assume you have isolated an unknown virus. It is a single- stranded RNA, enveloped virus. To which group does it most likely belong?

Correct AnswerverifiedShow Answer

The definition of lysogeny is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Bacteriophages and animal viruses do not differ significantly in which one of the following steps?

Correct AnswerverifiedShow Answer

Latent viruses are present in cells as

Correct AnswerverifiedC

Which of the following is not a method of culturing viruses?

Correct AnswerverifiedShow Answer

Generalized transduction differs from specialized transduction in that generalized transduction

Correct AnswerverifiedShow Answer

Figure 13.1 -In Figure 13.1, which of these is a complex virus?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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C

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B

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C

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