Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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 +RNAF) None of the above
G) B) and C) D

Question 3

The mechanism whereby an enveloped virus leaves a host cell is called

Accepted Answer

A)   budding.
B)   transduction.
C)   penetration.
D)   abduction.
E)   lysogeny.F) D) and E)
G) C) and D)

Question 4

The basic mechanism of viral multiplication is similar for all viruses.

Accepted Answer

A) True 
 B)False

Question 5

An example of a latent viral infection is

Accepted Answer

A)   cold sores.
B)   mumps.
C)   subacute sclerosing panencephalitis.
D)   smallpox.
E)   influenza.F) B) and E)
G) A) and C)

Question 6

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 acidF) C) and D)
G) B) and D)

Question 7

A segmented genome can result in antigenic shift.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

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

Question 9

Binomial nomenclature is used to name viruses.

Accepted Answer

A) True 
 B)False

Question 10

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) None of the above
F) A) and C)

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Discuss why viruses are considered infectious ʺparticlesʺ on the borderline between living and non-living.

Accepted Answer

not answered

Question 13

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.F) B) and C)
G) A) and E)

Question 14

Bacteriophages derive all of the following from the host cell EXCEPT

Accepted Answer

A)   tRNA.
B)   lysozyme.
C)   nucleotides.
D)   amino acids.
E)   ATP.F) B) and D)
G) C) and D) B

Question 15

Figure 13.2
 
-Assume a patient had chickenpox (human herpesvirus 3)  as a child. Which line on the graph in Figure 13.2 would show the number of viruses present in this person as a 60 -year-old with shingles (human herpesvirus 3) ?

Accepted Answer

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

Question 16

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)   attachmentF) A) and D)
G) B) and E)

Question 17

Figure 13.1
 
-In Figure 13.1, which structure is a complex virus?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   All of the structures are complex viruses.F) B) and E)
G) C) and E)

Question 18

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 are derived from primary cell lines.
C)   viruses can be grown in continuous cell lines.
D)   continuous cell lines are from human embryos.
E)   continuous cell lines can be maintained through an indefinite number of generations.F) None of the above
G) A) and C)

Question 19

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.F) All of the above
G) A) and C)

Question 20

Which of the following places these items in the correct order for DNA-virus replication? 1. Maturation
2)  DNA synthesis
3)  Transcription
4)  Translation

Accepted Answer

A)   2; 3; 4; 1
B)   4; 3; 2; 1
C)   3; 4; 1; 2
D)   4; 1; 2; 3
E)   1; 2; 3; 4F) D) and E)
G) B) and D)

Exam 13: Viruses, Viroids, and Prions

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

The mechanism whereby an enveloped virus leaves a host cell is called

Correct AnswerverifiedShow Answer

The basic mechanism of viral multiplication is similar for all viruses.

Correct AnswerverifiedShow Answer

An example of a latent viral infection is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A segmented genome can result in antigenic shift.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Binomial nomenclature is used to name viruses.

Correct AnswerverifiedShow Answer

A viral species is a group of viruses that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Discuss why viruses are considered infectious ʺparticlesʺ on the borderline between living and non-living.

Correct Answerverifiednot answered

The definition of lysogeny is

Correct AnswerverifiedShow Answer

Bacteriophages derive all of the following from the host cell EXCEPT

Correct AnswerverifiedB

Figure 13.2 -Assume a patient had chickenpox (human herpesvirus 3) as a child. Which line on the graph in Figure 13.2 would show the number of viruses present in this person as a 60 -year-old with shingles (human herpesvirus 3) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Figure 13.1 -In Figure 13.1, which structure is a complex virus?

Correct AnswerverifiedShow Answer

Continuous cell lines differ from primary cell lines in that

Correct AnswerverifiedShow Answer

Which of the following statements is FALSE?

Correct AnswerverifiedShow Answer

Which of the following places these items in the correct order for DNA-virus replication? 1. Maturation 2) DNA synthesis 3) Transcription 4) Translation

Correct AnswerverifiedShow Answer

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D

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B

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