Question 1

__________ are glycoprotein spikes protruding from the outer surface of the viral envelope.

Accepted Answer

The answer of __________ are glycoprotein spikes protruding from the...

Question 2

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 D)
F) All of the above

Question 3

Human cancer causing viruses most often have a ___________ genome.

Accepted Answer

A)  ssDNA
B)  dsDNA
C)  ssRNA
D)  dsRNAE) None of the above
F) All of the above

Question 4

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 D)
F) None of the above

Question 5

Two major types of symmetry found in viruses include

Accepted Answer

A)  icosahedral and radial.
B)  icosahedral and helical.
C)  helical and radial.
D)  radial and bilateral.E) B) and C)
F) A) and D)

Question 6

The mechanism of pathogenesis by prions may involve a conformational change in the prion protein (PrP)to an abnormal form.

Accepted Answer

A) True 
 B)False

Question 7

Some viruses cause abnormal growth of cells rather than destruction.This is called __________.

Accepted Answer

The answer of Some viruses cause abnormal growth of cells...

Question 8

Prions are of significance because they cause infections of

Accepted Answer

A)  domestic animals and humans.
B)  plants.
C)  fungi.
D)  prokaryotes.E) None of the above
F) A) and C)

Question 9

Which virion release process is most often used by enveloped viruses?

Accepted Answer

A)  Lysis
B)  Facilitated diffusion
C)  Budding
D)  Diffusion through channel proteinE) B) and D)
F) All of the above

Question 10

A PrPc protein can convert a PrPSc to a PrPc.

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Viroids are of economic significance because they cause disease in

Accepted Answer

A)  plants.
B)  animals.
C)  humans.
D)  All of the choices are correct.E) A) and D)
F) B) and C)

Question 13

Which of the following is true of viruses in the extracellular phase?

Accepted Answer

A)  They possess many different enzymes.
B)  They can reproduce independently of living cells but only at a slow rate.
C)  They behave as a macromolecular complex and are no more alive than are ribosomes.
D)  They possess many different enzymes and they can reproduce independently of living cells but only at a slow rate.E) C) and D)
F) None of the above

Question 14

Which of the following represent(s) the way(s) in which enveloped viruses acquire their envelopes?

Accepted Answer

A)  Budding through the plasma membrane.
B)  Budding through internal cellular membranes.
C)  Viral enzymes are responsible for production of the envelope.
D)  Some viruses bud through the plasma membrane while other bud through internal cellular membranes.E) All of the above
F) A) and D)

Question 15

Almost all known plant viruses are RNA viruses.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

Many of the enzymes found in virus particles are

Accepted Answer

A)  required for viral attachment to host cells.
B)  involved in viral entry into host cells.
C)  involved in the replication of viral nucleic acid.
D)  All of the choices are correct.E) All of the above
F) C) and D)

Question 18

Genes whose expression (or abnormal expression) causes cancer are called

Accepted Answer

A)  cancer genes.
B)  progenes.
C)  oncogenes.
D)  carcinogens.E) A) and B)
F) A) and C)

Question 19

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) A) and B)
F) A) and D)

Question 20

A temperate phage always lyses its host cell.

Accepted Answer

A) True 
 B)False

Exam 6: Viruses and Other Acellular Infectious Agents

Viroids are of economic significance because they cause disease in

Correct AnswerverifiedShow Answer

Many of the enzymes found in virus particles are

Correct AnswerverifiedShow Answer

Which of the following represent(s) the way(s) in which enveloped viruses acquire their envelopes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

__________ are glycoprotein spikes protruding from the outer surface of the viral envelope.

Correct AnswerverifiedShow Answer

Which virion release process is most often used by enveloped viruses?

Correct AnswerverifiedShow Answer

A temperate phage always lyses its host cell.

Correct AnswerverifiedShow Answer

Almost all known plant viruses are RNA viruses.

Correct AnswerverifiedShow Answer

Human cancer causing viruses most often have a ___________ genome.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not true of viroids?

Correct AnswerverifiedShow Answer

Prions are of significance because they cause infections of

Correct AnswerverifiedShow Answer

Which of the following is true of viruses in the extracellular phase?

Correct AnswerverifiedShow Answer

The mechanism of pathogenesis by prions may involve a conformational change in the prion protein (PrP)to an abnormal form.

Correct AnswerverifiedShow Answer

Virus morphology does not include which of the following characteristics?

Correct AnswerverifiedShow Answer

Genes whose expression (or abnormal expression) causes cancer are called

Correct AnswerverifiedShow Answer

A PrPc protein can convert a PrPSc to a PrPc.

Correct AnswerverifiedShow Answer

Some viruses cause abnormal growth of cells rather than destruction.This is called __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Two major types of symmetry found in viruses include

Correct AnswerverifiedShow Answer

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A PrP^c protein can convert a PrP^Sc to a PrP^c.

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