Microbiology 202: Virology Practice Exam Multiple
Choice with correct answers
Most scientists do not consider viruses to be "alive" because:
(a)They have no genes.
(b)Their metabolic machinery is borrowed from the host cell.
(c)They are unable to reproduce.
(d)No definite structural features are seen under the microscope.
(e)They are unable to evolve Correct Answer-b
Which of the following statements about viral capsids is
FALSE?
(a)Damage to one of the protein subunits of a virus capsid may destroy
the infectivity of the virus particle.
(b)One function of the outer shell (capsid) of a virus particle is to protect
the virus genome from chemical damage.
(c)The outer surface of the virus is responsible for recognition of the
host cell.
(d)One function of the outer shell (capsid) of a virus particle is to protect
the virus genome from enzymatic damage.
(e)One function of the outer shell (capsid) of a virus particle is to protect
the virus genome from physical damage. Correct Answer-a
For this question, pick as many answers as necessary to correctly answer
the question. Which of the following statement(s) would correctly finish
the statement. "Viruses
,_______________ "
(a)are carriers of genetic information.
(b)are obligate intracellular parasites.
(c)all have lipid bilayer envelopes.
(d)can replicate on their own.
(e)can reproduce within a host cell.
(f)utilize double-stranded DNA genomes at some point in their
replication cycle. Correct Answer-a b e
For this question, pick as many answers as necessary to correctly answer
the question.
A "permissive" viral infection always results in which of the following
outcomes?
(a)Inhibition of cellular protein synthesis.
(b)Transformation of the host cell into a tumour cell.
(c)Inhibition of cellular DNA replication.
(d)Integration of the viral genome into the host cell genome.
(e)Death of the host cell.
(f)Production of progeny virus. Correct Answer-f
Which two of the following statements BEST
describes all types of viruses that have an RNA
genome?
, (a)They always contain a gene encoding an RNA-dependent RNA or
DNA polymerase.
(b)The viral genomes can always act as mRNA.
(c)The virions of RNA viruses always contain an RNA-dependent RNA
or DNA polymerase protein.
(d)They are always single stranded.
(e)They have higher mutation frequencies relative to viruses containing
DNA genomes. Correct Answer-a e
Most enveloped viruses obtain their envelopes by:
(a)"stealing" and then modifying vesicles that may be used in the
exporting of cellular proteins.
(b)breaking down the membrane of the cell they infect and incorporating
the lipid into the capsids.
(c)budding through the cell's membrane as they leave an infected cell.
(d)encoding an enzyme which synthesize the necessary lipids for the
envelope.
(e)finding pieces of cell membrane released from dead cells and
wrapping it around them. Correct Answer-c
Which of the following most accurately describes a latent infection
caused by a virus?
(a)The virus replicates in the host and the host cell is usually killed by
the release of the
progeny viruses.
Choice with correct answers
Most scientists do not consider viruses to be "alive" because:
(a)They have no genes.
(b)Their metabolic machinery is borrowed from the host cell.
(c)They are unable to reproduce.
(d)No definite structural features are seen under the microscope.
(e)They are unable to evolve Correct Answer-b
Which of the following statements about viral capsids is
FALSE?
(a)Damage to one of the protein subunits of a virus capsid may destroy
the infectivity of the virus particle.
(b)One function of the outer shell (capsid) of a virus particle is to protect
the virus genome from chemical damage.
(c)The outer surface of the virus is responsible for recognition of the
host cell.
(d)One function of the outer shell (capsid) of a virus particle is to protect
the virus genome from enzymatic damage.
(e)One function of the outer shell (capsid) of a virus particle is to protect
the virus genome from physical damage. Correct Answer-a
For this question, pick as many answers as necessary to correctly answer
the question. Which of the following statement(s) would correctly finish
the statement. "Viruses
,_______________ "
(a)are carriers of genetic information.
(b)are obligate intracellular parasites.
(c)all have lipid bilayer envelopes.
(d)can replicate on their own.
(e)can reproduce within a host cell.
(f)utilize double-stranded DNA genomes at some point in their
replication cycle. Correct Answer-a b e
For this question, pick as many answers as necessary to correctly answer
the question.
A "permissive" viral infection always results in which of the following
outcomes?
(a)Inhibition of cellular protein synthesis.
(b)Transformation of the host cell into a tumour cell.
(c)Inhibition of cellular DNA replication.
(d)Integration of the viral genome into the host cell genome.
(e)Death of the host cell.
(f)Production of progeny virus. Correct Answer-f
Which two of the following statements BEST
describes all types of viruses that have an RNA
genome?
, (a)They always contain a gene encoding an RNA-dependent RNA or
DNA polymerase.
(b)The viral genomes can always act as mRNA.
(c)The virions of RNA viruses always contain an RNA-dependent RNA
or DNA polymerase protein.
(d)They are always single stranded.
(e)They have higher mutation frequencies relative to viruses containing
DNA genomes. Correct Answer-a e
Most enveloped viruses obtain their envelopes by:
(a)"stealing" and then modifying vesicles that may be used in the
exporting of cellular proteins.
(b)breaking down the membrane of the cell they infect and incorporating
the lipid into the capsids.
(c)budding through the cell's membrane as they leave an infected cell.
(d)encoding an enzyme which synthesize the necessary lipids for the
envelope.
(e)finding pieces of cell membrane released from dead cells and
wrapping it around them. Correct Answer-c
Which of the following most accurately describes a latent infection
caused by a virus?
(a)The virus replicates in the host and the host cell is usually killed by
the release of the
progeny viruses.
