Question 1

What type of phage enters an inactive prophage stage?

Accepted Answer

A)   Primary
B)   Secondary
C)   Temperate
D)   Temporary
E)   Transformed

Question 2

When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the
host cell.

Accepted Answer

A) True 
 B)False

Question 3

Spikes are glycoproteins that can be found projecting from the viral capsid.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is/are type(s)  of cytopathic effects?

Accepted Answer

A)   Inclusions in the nucleus
B)   Multinucleated giant cells
C)   Inclusions in the cytoplasm
D)   Rounding of cells
E)   All of the choices are correct.

Question 5

Lysogeny refers to _______.

Accepted Answer

A)   altering the host range of a virus
B)   the latent state of herpes infections
C)   virions exiting host cell
D)   the viral genome inserting into bacterial host chromosome

Question 6

Why do some animal viruses have an external envelope, while bacteriophages never do?

Accepted Answer

A)   Some animal viruses bud out, taking part of the plasma membrane with them, whereas phages always lyse the host bacterial cell when they exit.
B)   When bacteriophages bud out, the plasma membrane is beneath the cell wall and therefore cannot be removed.
C)   When animal cells are lysed, part of the plasma membrane attaches to the virus; in bacterial cells, it is covered by the cell wall.
D)   When phages bud out of the host bacterial cell, they take with them part of the cell wall which forms the capsid, not an envelope.

Question 7

New, nonenveloped virus release occurs by ______.

Accepted Answer

A)   lysis
B)   budding
C)   exocytosis
D)   both lysis and budding
E)   both budding and exocytosis

Question 8

Which of the following is not associated with every virus?

Accepted Answer

A)   Envelope
B)   Capsomeres
C)   Capsid
D)   Nucleic acid
E)   Genome

Question 9

Viruses with _____-sense RNA contain the correct message for translation, while viruses with _____-sense RNA must ﬁrst be converted into a correct message.

Accepted Answer

A)   positive; negative
B)   negative; positive
C)   primary; secondary
D)   secondary; primary
E)   intermediate; primary

Question 10

Oncogenic viruses include all the following except ______.

Accepted Answer

A)   hepatitis B virus
B)   measles virus
C)   Papillomavirus
D)   HTLV-I and HTLV-II viruses
E)   Epstein-Barr virus

Question 11

Viruses exhibit all the following except ______.

Accepted Answer

A)   deﬁnite shape
B)   metabolism
C)   genes
D)   ability to infect host cells
E)   ultramicroscopic size

Question 12

Compared to bacteria that have a typical size range between 1-10 μm, _______.

Accepted Answer

A)   viruses range in size between 20-200 nm and are much larger than bacterial cells
B)   viruses have a much greater size range; between 22 nm and 1000 nm
C)   all viruses are 22 nm
D)   viruses are larger and are blocked by sterilizing ﬁlters

Question 13

Which of the following occurs during assembly?

Accepted Answer

A)   The nucleocapsid is formed.
B)   New viral nucleic acid is formed.
C)   Viral spikes insert in host cell membrane.
D)   The nucleocapsid is formed and viral spikes insert in host cell membrane.
E)   The viral envelope and the host cell membrane fuse.

Question 14

Viral capsids are made from subunits called ______.

Accepted Answer

A)   envelopes
B)   spikes
C)   capsomeres
D)   prophages
E)   peptones

Question 15

Viral classiﬁcation has changed over the years and while they are given genus names, the use of species names has not been widely accepted. This is because ________.

Accepted Answer

A)   viruses are not organisms
B)   viruses change over time making species characteristics diﬃcult to stabilize
C)   viruses that could be classiﬁed into a single species may have many, but not all, properties in common
D)   All of these choices are arguments against using species designations for viruses.

Question 16

In transduction, the viral genome _______.

Accepted Answer

A)   initiates lysis of the host
B)   includes DNA from the previous host
C)   is replicated in the cytoplasm
D)   is replicated in the nucleus

Question 17

Which of the following represents a virus family name?

Accepted Answer

A)   Herpes simplex virus
B)   Herpesviridae
C)   Picornavirus
D)   Enterovirus
E)   Hepatitis B virus

Question 18

The activation of a prophage is called ______.

Accepted Answer

A)   activation
B)   lysogeny
C)   transformation
D)   induction
E)   adsorption

Question 19

Diagnosis of viral infections sometimes involves analyzing the patient's blood for speciﬁc _____ that the immune system produces against the virus.

Accepted Answer

A)   glycoproteins
B)   antibodies
C)   complement proteins
D)   antigens

Question 20

Viruses mutate, and some viruses have not been discovered.

Accepted Answer

A) True 
 B)False

Exam 6: Viruses and Prions

Which of the following represents a virus family name?

Correct AnswerverifiedShow Answer

Which of the following is not associated with every virus?

Correct AnswerverifiedShow Answer

What type of phage enters an inactive prophage stage?

Correct AnswerverifiedShow Answer

Why do some animal viruses have an external envelope, while bacteriophages never do?

Correct AnswerverifiedShow Answer

In transduction, the viral genome _______.

Correct AnswerverifiedShow Answer

The activation of a prophage is called ______.

Correct AnswerverifiedShow Answer

Lysogeny refers to _______.

Correct AnswerverifiedShow Answer

Viruses mutate, and some viruses have not been discovered.

Correct AnswerverifiedShow Answer

Spikes are glycoproteins that can be found projecting from the viral capsid.

Correct AnswerverifiedShow Answer

Compared to bacteria that have a typical size range between 1-10 μm, _______.

Correct AnswerverifiedShow Answer

Oncogenic viruses include all the following except ______.

Correct AnswerverifiedShow Answer

Which of the following occurs during assembly?

Correct AnswerverifiedShow Answer

Diagnosis of viral infections sometimes involves analyzing the patient's blood for speciﬁc _____ that the immune system produces against the virus.

Correct AnswerverifiedShow Answer

When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.

Correct AnswerverifiedShow Answer

Viral classiﬁcation has changed over the years and while they are given genus names, the use of species names has not been widely accepted. This is because ________.

Correct AnswerverifiedShow Answer

Viruses with _____-sense RNA contain the correct message for translation, while viruses with _____-sense RNA must ﬁrst be converted into a correct message.

Correct AnswerverifiedShow Answer

Which of the following is/are type(s) of cytopathic effects?

Correct AnswerverifiedShow Answer

Viruses exhibit all the following except ______.

Correct AnswerverifiedShow Answer

Viral capsids are made from subunits called ______.

Correct AnswerverifiedShow Answer

New, nonenveloped virus release occurs by ______.

Correct AnswerverifiedShow Answer

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Viruses with _-sense RNA contain the correct message for translation, while viruses with _-sense RNA must ﬁrst be converted into a correct message.

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