Question 1

Viruses are used to produce vaccines for prevention of certain viral infections.

Accepted Answer

A) True 
 B)False

Question 2

A fully formed virus that can cause an infection in a host cell is called a virion.

Accepted Answer

A) True 
 B)False

Question 3

The primary purpose(s) of viral cultivation is/are to

Accepted Answer

A)   isolate and identify viruses in clinical specimens.
B)   prepare viruses for vaccines.
C)   do detailed research on viral structure, lifestyle, genetics, and effects on host cells.
D)   perform wide-scale harvesting of viruses.
E)   All of the choices are correct.

Question 4

What structures are used by bacteriophages to attach to host cell receptors?

Accepted Answer

A)   Viral sheaths
B)   Tail fibers
C)   Nucleic acids
D)   Capsid heads

Question 5

Antiviral drugs are often difficult to develop,largely because

Accepted Answer

A)   viruses are obligate intracellular parasites so the drugs must enter the host cell and often cause toxic side effects in order to destroy the virus.
B)   viruses are more abundant in the body than bacterial cells.
C)   viruses are much smaller than bacterial cells.
D)   viruses are more pathogenic than bacterial cells.

Question 6

When a virus enters a host cell,the viral genes redirect the genetic and metabolic activities of the host cell.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following is a true statement regarding lysogeny?

Accepted Answer

A)   Once the phage genome is integrated into the host cell, it remains there permanently.
B)   The host bacterial cell acquires new characteristics that are often detrimental to humans.
C)   It halts the viral life cycle because the phage genes are no longer replicated.
D)   The host bacterial cell is lysed once the phage genome is integrated.

Question 8

Viruses attach to their hosts via ______.

Accepted Answer

A)   host glycoproteins
B)   host phospholipids
C)   viral phospholipids
D)   viral flagella
E)   carbohydrate attachments of the viral capsid

Question 9

In order to replicate within a host cell,a virus with a genome comprised of single-stranded positive-sense RNA

Accepted Answer

A)   must use its genomic strand as a template to make copies of negative-sense RNA for packaging.
B)   must use its genomic strand as a template to make copies of positive-sense RNA for packaging.
C)  must first use its genomic strand as a template to make a negative-sense RNA, which then serves as a template to synthesize positive-sense RNA for packaging.
D)   must first use its genomic strand as a template to make copies of DNA for packaging.

Question 10

All of the following pertain to virus envelopes except

Accepted Answer

A)   gained as a virus leaves the host cell membrane.
B)   gained as a virus leaves the nuclear membrane.
C)   contain special virus proteins.
D)   help the virus particle attach to host cells.
E)   located between the capsid and nucleic acid.

Question 11

Animal viruses have the ability to attach to and enter almost any animal host cell.

Accepted Answer

A) True 
 B)False

Question 12

Helical and icosahedral are terms used to describe the shape of a viral ______.

Accepted Answer

A)   spike
B)   capsomere
C)   envelope
D)   capsid
E)   core

Question 13

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Accepted Answer

A) True 
 B)False

Question 14

Classification of viruses into families involves determining all the following characteristics except

Accepted Answer

A)   type of nucleic acid.
B)   type of capsid.
C)   presence of an envelope.
D)   biochemical reactions.
E)   number of strands in the nucleic acid.

Question 15

Each virus is classified into a genus based on its host,target tissue,and type of disease it causes.

Accepted Answer

A) True 
 B)False

Question 16

Using species names for viruses is controversial since viruses are not considered living organisms,and they change over time so characteristics that may be used for speciation are unstable.

Accepted Answer

A) True 
 B)False

Exam 6: An Introduction to the Viruses

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Correct Answer
verified

Each virus is classified into a genus based on its host,target tissue,and type of disease it causes.

Correct Answer
verified

A fully formed virus that can cause an infection in a host cell is called a virion.

Correct Answer
verified

Animal viruses have the ability to attach to and enter almost any animal host cell.

Correct Answer
verified

Using species names for viruses is controversial since viruses are not considered living organisms,and they change over time so characteristics that may be used for speciation are unstable.

Correct Answer
verified

All of the following pertain to virus envelopes except

Correct Answer
verified

When a virus enters a host cell,the viral genes redirect the genetic and metabolic activities of the host cell.

Correct Answer
verified

The primary purpose(s) of viral cultivation is/are to

Correct Answer
verified

Antiviral drugs are often difficult to develop,largely because

Correct Answer
verified

In order to replicate within a host cell,a virus with a genome comprised of single-stranded positive-sense RNA

Correct Answer
verified

What structures are used by bacteriophages to attach to host cell receptors?

Correct Answer
verified

Which of the following is a true statement regarding lysogeny?

Correct Answer
verified

Helical and icosahedral are terms used to describe the shape of a viral ______.

Correct Answer
verified

Classification of viruses into families involves determining all the following characteristics except

Correct Answer
verified

Viruses attach to their hosts via ______.

Correct Answer
verified

Viruses are used to produce vaccines for prevention of certain viral infections.

Correct Answer
verified

Exam 6: An Introduction to the Viruses

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Correct AnswerverifiedShow Answer

Each virus is classified into a genus based on its host,target tissue,and type of disease it causes.

Correct AnswerverifiedShow Answer

A fully formed virus that can cause an infection in a host cell is called a virion.

Correct AnswerverifiedShow Answer

Animal viruses have the ability to attach to and enter almost any animal host cell.

Correct AnswerverifiedShow Answer

Using species names for viruses is controversial since viruses are not considered living organisms,and they change over time so characteristics that may be used for speciation are unstable.

Correct AnswerverifiedShow Answer

All of the following pertain to virus envelopes except

Correct AnswerverifiedShow Answer

When a virus enters a host cell,the viral genes redirect the genetic and metabolic activities of the host cell.

Correct AnswerverifiedShow Answer

The primary purpose(s) of viral cultivation is/are to

Correct AnswerverifiedShow Answer

Antiviral drugs are often difficult to develop,largely because

Correct AnswerverifiedShow Answer

In order to replicate within a host cell,a virus with a genome comprised of single-stranded positive-sense RNA

Correct AnswerverifiedShow Answer

What structures are used by bacteriophages to attach to host cell receptors?

Correct AnswerverifiedShow Answer

Which of the following is a true statement regarding lysogeny?

Correct AnswerverifiedShow Answer

Helical and icosahedral are terms used to describe the shape of a viral ______.

Correct AnswerverifiedShow Answer

Classification of viruses into families involves determining all the following characteristics except

Correct AnswerverifiedShow Answer

Viruses attach to their hosts via ______.

Correct AnswerverifiedShow Answer

Viruses are used to produce vaccines for prevention of certain viral infections.

Correct AnswerverifiedShow Answer

Correct Answer
verified

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