Question 1

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

Question 3

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

Accepted Answer

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

Question 4

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 C)
F) A) and D)

Question 5

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 choicesE) None of the above
F) B) and C)

Question 6

Like bacteria and eukaryotic microorganisms,most viruses can be cultured using artificial media.

Accepted Answer

A) True 
 B)False

Question 7

Almost all known plant viruses are RNA viruses.

Accepted Answer

A) True 
 B)False

Question 8

Viral envelopes are composed of

Accepted Answer

A)  proteins.
B)  lipids.
C)  carbohydrates.
D)  all of the choicesE) A) and C)
F) A) and D)

Question 9

The protein coat surrounding the viral genome is called the

Accepted Answer

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

Question 10

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

Accepted Answer

A)  cancer genes.
B)  progenies.
C)  oncogenes.
D)  carcinogens.E) None of the above
F) A) and D)

Question 11

Viruses have typical cellular structure like other living organisms.

Accepted Answer

A) True 
 B)False

Question 12

Some complex viruses have icosahedral symmetry in the head region and helical symmetry in the tail.Overall,these viruses are said to have __________ symmetry.

Accepted Answer

A)  bilateral
B)  binal
C)  complex
D)  none of theseE) A) and B)
F) A) and C)

Question 13

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 C)
F) All of the above

Question 14

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 15

The most common capsid morphologies are icosahedral and helical.

Accepted Answer

A) True 
 B)False

Question 16

The presence or absence of an envelope is not useful in classifying viruses because any given virus may at one time have an envelope and at another time not have an envelope.

Accepted Answer

A) True 
 B)False

Question 17

Viruses such as MS2 and Qß pack additional information into their genomes through the use of overlapping genes.

Accepted Answer

A) True 
 B)False

Question 18

Bacterial viruses are so named because they have prokaryotic cell structures similar to their bacterial hosts.
ASM

Accepted Answer

A) True 
 B)False  False

Question 19

A __________ genome exists as several separate,nonidentical molecules that may be packaged together or separately.

Accepted Answer

A)  diploid
B)  segmented
C)  polyploid
D)  fractionatedE) C) and D)
F) B) and D)

Question 20

Nonenveloped viruses most often gain access to eukaryotic host cells by

Accepted Answer

A)  fusion with the host cell plasma membrane followed by entrance of the nucleocapsid into the cytoplasm.
B)  endocytosis.
C)  pinocytosis.
D)  nucleic acid injection through the plasma membrane.E) C) and D)
F) B) and D) B

Exam 6: Viruses and Other Acellular Infectious Agents

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

Correct AnswerverifiedShow Answer

Viroids are:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Prions are of significance because they cause infections of

Correct AnswerverifiedShow Answer

Many of the enzymes found in virus particles are

Correct AnswerverifiedShow Answer

Like bacteria and eukaryotic microorganisms,most viruses can be cultured using artificial media.

Correct AnswerverifiedShow Answer

Almost all known plant viruses are RNA viruses.

Correct AnswerverifiedShow Answer

Viral envelopes are composed of

Correct AnswerverifiedShow Answer

The protein coat surrounding the viral genome is called the

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

Viruses have typical cellular structure like other living organisms.

Correct AnswerverifiedShow Answer

Some complex viruses have icosahedral symmetry in the head region and helical symmetry in the tail.Overall,these viruses are said to have __________ symmetry.

Correct AnswerverifiedShow Answer

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

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

The most common capsid morphologies are icosahedral and helical.

Correct AnswerverifiedShow Answer

The presence or absence of an envelope is not useful in classifying viruses because any given virus may at one time have an envelope and at another time not have an envelope.

Correct AnswerverifiedShow Answer

Viruses such as MS2 and Qß pack additional information into their genomes through the use of overlapping genes.

Correct AnswerverifiedShow Answer

Bacterial viruses are so named because they have prokaryotic cell structures similar to their bacterial hosts. ASM

Correct AnswerverifiedFalse

A __________ genome exists as several separate,nonidentical molecules that may be packaged together or separately.

Correct AnswerverifiedShow Answer

Nonenveloped viruses most often gain access to eukaryotic host cells by

Correct AnswerverifiedB

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B

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False

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B