Question 1

Oncogenic viruses

Accepted Answer

A)  are genetically unstable.
B)   cause acute infections.
C)   have no effect on the host cell.
D)   are lytic viruses that kill the host cell.
E)   cause tumors to develop.F) A) and B)
G) B) and C)

Question 2

Assume you have isolated an unknown virus. This virus has a single, positive sense strand of RNA, and possesses an envelope. To which group does it most likely belong?

Accepted Answer

A)   togavirus
B)   herpesvirus
C)   picornavirus
D)   papovavirus
E)   retrovirusF) A) and D)
G) C) and E)

Question 3

A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid.

Accepted Answer

A) True 
 B)False

Question 4

A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient?

Accepted Answer

A)   The virus is infecting cells and then releasing only small amounts of virus.
B)   The virus is not killing any cells in the host.
C)   The virus is causing the death of the infected cells in the patient.
D)   The virus is incorporating its nucleic acid with that of the patient's cells.
E)   The virus is slowly killing the patient's cells.F) A) and B)
G) D) and E)

Question 5

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

Accepted Answer

A)   spike proteins
B)   DNA polymerase
C)   lysozyme
D)   envelope proteins
E)   capsid proteinsF) A) and B)
G) B) and D)

Question 6

Dogs do not get measles because their cells lack the correct receptor sites for that virus.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

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

Question 8

Which of the following statements about viral spikes is FALSE?

Accepted Answer

A)   They are composed of carbohydrate- protein complexes.
B)   They bind to receptors on the host cell surface.
C)   They are used for attachment.
D)   They are found only on nonenveloped viruses.
E)   They may cause hemagglutination.F) C) and E)
G) None of the above

Question 9

Most drugs that interfere with viral multiplication also interfere with host cell function.

Accepted Answer

A) True 
 B)False

Question 10

The definition of lysogeny is

Accepted Answer

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

Question 11

Lysogeny can result in all of the following EXCEPT

Accepted Answer

A)   immunity to reinfection by the same phage.
B)   immunity to reinfection by any phage.
C)   acquisition of new characteristics by the host cell.
D)   phage conversion.
E)   specialized transduction.F) None of the above
G) A) and E)

Question 12

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

Accepted Answer

A)   morphology
B)   nucleic acid
C)   biochemical tests
D)   size
E)   number of capsomeresF) A) and D)
G) A) and C)

Question 13

Which of the following would be the first step in biosynthesis of a virus with a - (minus)  strand of RNA?

Accepted Answer

A)   synthesis of double- stranded RNA from a DNA template
B)   synthesis of double- stranded RNA from an RNA template
C)   synthesis of DNA from a DNA template
D)   synthesis of DNA from an RNA template
E)   transcription of mRNA from DNAF) C) and D)
G) A) and E)

Question 14

Most RNA viruses carry which of the following enzymes?

Accepted Answer

A)   ATP synthase
B)   DNA- dependent DNA polymerase
C)   reverse transcriptase
D)   RNA- dependent RNA polymerase
E)   lysozymeF) None of the above
G) A) and E)

Question 15

A persistent infection is one in which

Accepted Answer

A)   viral replication is unusually slow.
B)   the disease process occurs gradually over a long period.
C)   the virus remains in equilibrium with the host without causing a disease.
D)   host cells are gradually lysed.
E)   host cells are transformed.F) A) and D)
G) B) and E)

Question 16

Continuous cell lines differ from primary cell lines in that

Accepted Answer

A)   continuous cell lines always have to be re- isolated from animal tissues.
B)   continuous cell lines can be maintained through an indefinite number of generations.
C)   viruses can be grown in continuous cell lines.
D)   continuous cell lines are from human embryos.
E)   continuous cell lines are derived from primary cell lines.F) C) and D)
G) A) and B)

Question 17

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

Accepted Answer

A)   Herpesviridae.
B)   Retroviridae.
C)   Hepadnaviridae.
D)   influenzavirus.
E)   bacteriophage families.F) None of the above
G) A) and B)

Question 18

A viral species is a group of viruses that

Accepted Answer

A)   has the same genetic information and ecological niche.
B)   has the same morphology and nucleic acid.
C)   infects the same cells and cause the same disease.
D)   cannot be defined.E) B) and C)
F) A) and C)

Question 19

A clear area against a confluent "lawn" of bacteria is called a

Accepted Answer

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

Question 20

Which of the following is NOT utilized to culture viruses?

Accepted Answer

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

Exam 13: Viruses, Viroids, and Prions

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

Correct AnswerverifiedShow Answer

Most RNA viruses carry which of the following enzymes?

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

Correct AnswerverifiedShow Answer

A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid.

Correct AnswerverifiedShow Answer

Dogs do not get measles because their cells lack the correct receptor sites for that virus.

Correct AnswerverifiedShow Answer

Lysogeny can result in all of the following EXCEPT

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A clear area against a confluent "lawn" of bacteria is called a

Correct AnswerverifiedShow Answer

Which of the following is NOT utilized to culture viruses?

Correct AnswerverifiedShow Answer

Most drugs that interfere with viral multiplication also interfere with host cell function.

Correct AnswerverifiedShow Answer

Oncogenic viruses

Correct AnswerverifiedShow Answer

Assume you have isolated an unknown virus. This virus has a single, positive sense strand of RNA, and possesses an envelope. To which group does it most likely belong?

Correct AnswerverifiedShow Answer

Continuous cell lines differ from primary cell lines in that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A persistent infection is one in which

Correct AnswerverifiedShow Answer

A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient?

Correct AnswerverifiedShow Answer

The definition of lysogeny is

Correct AnswerverifiedShow Answer

Which of the following would be the first step in biosynthesis of a virus with a - (minus) strand of RNA?

Correct AnswerverifiedShow Answer

Which of the following statements about viral spikes is FALSE?

Correct AnswerverifiedShow Answer

A viral species is a group of viruses that

Correct AnswerverifiedShow Answer

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