Question 1

Viruses infecting protists,including algae,have never been detected.

Accepted Answer

A) True 
 B)False

Question 2

The function of the viral protein coat is to

Accepted Answer

A)  protect the viral genetic material.
B)  aid in the transfer of the viral genetic material between host cells.
C)  elicit the production of protective antibodies.
D)  protect the viral genetic material and aid in the transfer of the viral genetic material between host cells.E) All of the above
F) None of the above

Question 3

In an enveloped virus,the part of the virus including the nucleic acid genome and the surrounding protein coat but not the envelope is called the

Accepted Answer

A)  capsid.
B)  nucleocapsid.
C)  matrix.
D)  virion.E) All of the above
F) A) and C)

Question 4

Which of the following has been associated with a form of liver cancer?

Accepted Answer

A)  Human papilloma virus.
B)  Hepatitis B virus.
C)  Human T-cell lymphotropic virus.
D)  Hepatitis A virus.E) All of the above
F) None of the above

Question 5

A complete virus particle is called a

Accepted Answer

A)  capsid.
B)  nucleocapsid.
C)  virion.
D)  cell.E) A) and B)
F) None of the above

Question 6

In a plaque assay,the number of infectious virions is usually identical to the number of virus particles present.

Accepted Answer

A) True 
 B)False

Question 7

Most enveloped viruses use the host __________ membrane as their envelope source.

Accepted Answer

A)  plasma
B)  nuclear
C)  mitochondrial
D)  none of theseE) None of the above
F) B) and C)

Question 8

Which of the following is not true of viroids?

Accepted Answer

A)  Viroids are small circular ssRNA molecules.
B)  Viroids have no protein capsids.
C)  Viroid RNA does not serve as mRNA nor does it direct the synthesis of mRNA.
D)  Extracellular viroids have a lipid bilayer envelope.E) B) and D)
F) A) and B)

Question 9

Enveloped viruses may enter their host cells by engulfment within coated vesicles (endocytosis).

Accepted Answer

A) True 
 B)False

Question 10

Hemagglutination is

Accepted Answer

A)  the clumping together of red blood cells in the presence of a viral suspension.
B)  the binding of iron in the process of a viral suspension.
C)  the clumping together of infected cells in the presence of a viral suspension.
D)  none of the choicesE) A) and D)
F) A) and C)

Question 11

Prions consist of proteins and have no apparent nucleic acid genome.

Accepted Answer

A) True 
 B)False

Question 12

Viruses in the extracellular state possess few,if any,active enzymes.

Accepted Answer

A) True 
 B)False

Question 13

Which is not true of viruses?

Accepted Answer

A)  They can exist in an intracellular or extracellular phase.
B)  They infect animal and plant cells only.
C)  They can be observed with an electron microscope.
D)  They are acellular.
E)  They replicate only inside host cells.F) C) and D)
G) All of the above

Question 14

Virus receptors are often not distributed uniformly over the surface of host cells,but are instead concentrated in lipid rafts.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is most true of a viral DNA genome?

Accepted Answer

A)  It uses the same four nitrogenous bases found in prokaryotic and eukaryotic DNA.
B)  It may have the normal bases found in prokaryotic and eukaryotic DNA,or it may have one or more unusual bases.
C)  It is usually composed of unusual bases unique to viruses.
D)  Viruses do not use DNA for their genome.E) C) and D)
F) None of the above

Question 16

Viruses that are polyhedrons with 20 sides are said to have __________ symmetry.

Accepted Answer

The answer of Viruses that are polyhedrons with 20 sides...

Question 17

Viral capsids are generally constructed without any outside aid once the subunits have been synthesized.This process is called

Accepted Answer

A)  facilitated assembly.
B)  self-assembly.
C)  spontaneous maturation.
D)  self-maturation.E) B) and C)
F) All of the above

Question 18

Virus morphology does not include which of the following characteristics?

Accepted Answer

A)  size
B)  shape
C)  presence or absence of an envelope
D)  host rangeE) B) and C)
F) A) and D)

Question 19

Glycoprotein spikes protruding from the outer surface of viral envelopes function as

Accepted Answer

A)  toxins.
B)  factors that bind to host cells.
C)  cell lysis factors.
D)  factors needed for site specific recombination.E) A) and C)
F) C) and D)

Question 20

Available evidence is consistent with the proposal that prion diseases are caused by infectious proteins.

Accepted Answer

A) True 
 B)False

Exam 6: Viruses and Other Acellular Infectious Agents

Viruses in the extracellular state possess few,if any,active enzymes.

Correct AnswerverifiedShow Answer

Viruses infecting protists,including algae,have never been detected.

Correct AnswerverifiedShow Answer

In an enveloped virus,the part of the virus including the nucleic acid genome and the surrounding protein coat but not the envelope is called the

Correct AnswerverifiedShow Answer

Viruses that are polyhedrons with 20 sides are said to have __________ symmetry.

Correct AnswerverifiedShow Answer

The function of the viral protein coat is to

Correct AnswerverifiedShow Answer

Prions consist of proteins and have no apparent nucleic acid genome.

Correct AnswerverifiedShow Answer

In a plaque assay,the number of infectious virions is usually identical to the number of virus particles present.

Correct AnswerverifiedShow Answer

Virus receptors are often not distributed uniformly over the surface of host cells,but are instead concentrated in lipid rafts.

Correct AnswerverifiedShow Answer

Which of the following is most true of a viral DNA genome?

Correct AnswerverifiedShow Answer

Virus morphology does not include which of the following characteristics?

Correct AnswerverifiedShow Answer

Enveloped viruses may enter their host cells by engulfment within coated vesicles (endocytosis).

Correct AnswerverifiedShow Answer

Which of the following is not true of viroids?

Correct AnswerverifiedShow Answer

Hemagglutination is

Correct AnswerverifiedShow Answer

Glycoprotein spikes protruding from the outer surface of viral envelopes function as

Correct AnswerverifiedShow Answer

Which of the following has been associated with a form of liver cancer?

Correct AnswerverifiedShow Answer

A complete virus particle is called a

Correct AnswerverifiedShow Answer

Viral capsids are generally constructed without any outside aid once the subunits have been synthesized.This process is called

Correct AnswerverifiedShow Answer

Available evidence is consistent with the proposal that prion diseases are caused by infectious proteins.

Correct AnswerverifiedShow Answer

Which is not true of viruses?

Correct AnswerverifiedShow Answer

Most enveloped viruses use the host __________ membrane as their envelope source.

Correct AnswerverifiedShow Answer

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