Question 1

Explain the steps involved in bacteriophage DNA entering a bacterial cell.

Accepted Answer

Bacteriophage DNA entering a bacterial c...

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

A)  attachment
B)  penetration
C)  uncoating
D)  biosynthesis
E)  releaseF) C) and E)
G) All of the above

Question 4

Researchers studying tissues of diseased marine mammals have identified what appear to be viral particles by electron microscopy.Describe three methods you might use to attempt to culture this virus for further study.

Accepted Answer

1. Cell culture: One method to attempt t...

Question 5

What is the key characteristic of a transformed cell?

Accepted Answer

A)  has acquired tumor-forming properties
B)  is producing toxins affecting neighboring cells
C)  is producing budding viruses
D)  has undergone chromosomal rearrangements
E)  is infected with a lytic virusF) C) and D)
G) A) and D)

Question 6

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 use the anabolic machinery of the cell.
D)  Viruses use their own catabolic enzymes.
E)  Viruses have genes.F) A) and B)
G) A) and C)

Question 7

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

Accepted Answer

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

Question 8

Why do most scientists agree that viruses are nonliving entities?

Accepted Answer

A)  They cannot replicate outside host cells.
B)  They are composed of relatively simple components.
C)  They pass through filters.
D)  They cause diseases in host cells.
E)  They are not composed of cells.F) A) and B)
G) B) and D)

Question 9

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) A) and E)
G) A) and C)

Question 10

Glycoprotein spikes are found on the capsids of all viruses.

Accepted Answer

A) True 
 B)False

Question 11

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)  herpesvirus
B)  picornavirus
C)  retrovirus
D)  togavirus
E)  papovavirusF) All of the above
G) C) and D)

Question 12

An example of a latent viral infection is

Accepted Answer

A)  subacute sclerosing panencephalitis.
B)  cold sores.
C)  influenza.
D)  smallpox.
E)  mumps.F) None of the above
G) A) and E)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

Figure 13.1
 
-The morphological types of viruses illustrated in Figure 13.1 are ultimately determined by the

Accepted Answer

A)  nucleic acid.
B)  envelope.
C)  capsomeres.
D)  viroids.
E)  membrane spikes.F) A) and C)
G) All of the above

Question 15

A viroid is a(n)

Accepted Answer

A)  complete,infectious virus particle.
B)  infectious piece of RNA without a capsid.
C)  capsid without nucleic acid.
D)  provirus.
E)  infectious protein.F) A) and C)
G) B) and C)

Question 16

How do all viruses differ from bacteria?

Accepted Answer

A)  Viruses are filterable.
B)  Viruses are obligate intracellular parasites.
C)  Viruses do not have any nucleic acid.
D)  Viruses are not composed of cells.
E)  Viruses do not reproduce.F) A) and D)
G) C) and D)

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

What is NOT true regarding viruses that infect plants?

Accepted Answer

A)  They can spread via pollination.
B)  They must enter through a wound or be introduced by an inset feeding.
C)  They can sometimes be cultured in insect cells.
D)  They are often cultured in embryonated chicken eggs.
E)  They are morphologically similar to animal viruses.F) B) and D)
G) A) and D)

Question 19

Most RNA viruses carry which of the following enzymes?

Accepted Answer

A)  DNA-dependent DNA polymerase
B)  lysozyme
C)  RNA-dependent RNA polymerase
D)  reverse transcriptase
E)  ATP synthaseF) A) and D)
G) B) and D)

Question 20

Which of the following is NOT utilized to culture viruses?

Accepted Answer

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

Exam 13: Viruses,viroids,and Prions

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

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Figure 13.1 -The morphological types of viruses illustrated in Figure 13.1 are ultimately determined by the

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Glycoprotein spikes are found on the capsids of all 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

What is NOT true regarding viruses that infect plants?

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

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Why do most scientists agree that viruses are nonliving entities?

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Which of the following is NOT utilized to culture viruses?

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

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An example of a latent viral infection is

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Explain the steps involved in bacteriophage DNA entering a bacterial cell.

Correct AnswerAnswered by ExamLex AIBacteriophage DNA entering a bacterial c...View AnswerShow Answer

A viroid is a(n)

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Most RNA viruses carry which of the following enzymes?

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How do all viruses differ from bacteria?

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

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Researchers studying tissues of diseased marine mammals have identified what appear to be viral particles by electron microscopy.Describe three methods you might use to attempt to culture this virus for further study.

Correct AnswerAnswered by ExamLex AI1. Cell culture: One method to attempt t...View AnswerShow Answer

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

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What is the key characteristic of a transformed cell?

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Which of the following statements about viruses is FALSE?

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

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Bacteriophage DNA entering a bacterial c...
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1. Cell culture: One method to attempt t...
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