Question 1

Microscopic or macroscopic degenerative changes or abnormalities in infected host cells and tissues are called __________ __________.

Accepted Answer

The answer of Microscopic or macroscopic degenerative changes or abnormalities...

Question 2

Viroids are:

Accepted Answer

A)   proteins that may infect man and other animals causing spongiform encephalopathy.
B)   a class of so-called slow viruses.
C)   a new class of small single stranded DNA viruses that infect some animals.
D)   short infectious single stranded RNAs that can infect some plants.E) A) and B)
F) A) and C)

Question 3

The protein coat surrounding the viral genome is called the

Accepted Answer

A)   capsule.
B)   capsid.
C)   matrix.
D)   envelope.E) C) and D)
F) None of the above

Question 4

Viruses have typical cellular structure like other living organisms.

Accepted Answer

A) True 
 B)False

Question 5

Adult T-cell leukemia is thought to be caused by

Accepted Answer

A)   herpesviruses.
B)   retroviruses.
C)   parvoviruses.
D)   picornaviruses.E) All of the above
F) A) and D)

Question 6

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)   For some viruses, a is correct; for other viruses, b is correct.E) A) and B)
F) A) and C)

Question 7

Viroids are of economic significance because they cause disease in

Accepted Answer

A)   plants.
B)   animals.
C)   humans.
D)   all of the choicesE) B) and C)
F) B) and D)

Question 8

Almost all known plant viruses are RNA viruses.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

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

Question 10

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) All of the above
F) A) and B)

Question 11

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) A) and B)
F) A) and C)

Question 12

Which of the following is not a mechanism by which viruses cause cancer?

Accepted Answer

A)   They carry a cancer-causing gene into the cell.
B)   They encode proteins that bind to and inactivate host cell proteins known as tumor suppressor proteins.
C)   They produce defective interfering particles.
D)   An expression of viral proteins results in abnormal expression of genes that regulate cell growth and reproduction.E) A) and B)
F) A) and D)

Question 13

Icosahedral viruses are constructed from ring- or knob-shaped units called __________.

Accepted Answer

The answer of Icosahedral viruses are constructed from ring- or...

Question 14

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) A) and C)
F) None of the above

Question 15

One way in which small viruses package more information into a very small genome is to use overlapping genes so that the same base sequence is read in more than one reading frame.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A) True 
 B)False  False

Question 17

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 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

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

Accepted Answer

A) True 
 B)False  True

Question 20

Prions are of significance because they cause infections of

Accepted Answer

A)   domestic animals and humans.
B)   plants.
C)   fungi.
D)   prokaryotes.E) A) and D)
F) A) and C) A

Exam 5: Viruses and Other Acellular Infectious Agents

Microscopic or macroscopic degenerative changes or abnormalities in infected host cells and tissues are called __________ __________.

Correct AnswerverifiedShow Answer

Viroids are:

Correct AnswerverifiedShow Answer

The protein coat surrounding the viral genome is called the

Correct AnswerverifiedShow Answer

Viruses have typical cellular structure like other living organisms.

Correct AnswerverifiedShow Answer

Adult T-cell leukemia is thought to be caused by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viroids are of economic significance because they cause disease in

Correct AnswerverifiedShow Answer

Almost all known plant viruses are RNA viruses.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Two major types of symmetry found in viruses include

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

Which of the following is not a mechanism by which viruses cause cancer?

Correct AnswerverifiedShow Answer

Icosahedral viruses are constructed from ring- or knob-shaped units called __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

One way in which small viruses package more information into a very small genome is to use overlapping genes so that the same base sequence is read in more than one reading frame.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

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

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 AnswerverifiedTrue

Prions are of significance because they cause infections of

Correct AnswerverifiedA

Microscopic or macroscopic degenerative changes or abnormalities in infected host cells and tissues are called .

Correct Answer
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A