Question 1

Some animals can become infected with multiple inﬂuenza virus strains usually associated with other animals. Which statement below describes the result of these infections?

Accepted Answer

A)   A new novel strain of ﬂu may be produced, for which the human population has no immunity.
B)   Major genetic variations in the ﬂu viruses can be reproduced.
C)   The viral genomes within the host cells can become recombined.
D)   All of the choices are correct.

Question 2

Viruses are considered ultramicroscopic because they range in size from 2 mm to 450 mm.

Accepted Answer

A) True 
 B)False

Question 3

Viral tissue speci?cities are called ______.

Accepted Answer

A)   ranges
B)   virions
C)   receptacles
D)   tropisms
E)   uncoating

Question 4

Two noncellular agents, smaller than viruses, are infectious proteins called _____ and infectious RNA strands called _____.

Accepted Answer

A)   prions; capsomeres
B)   virions; prions
C)   viroids; phages
D)   prions; phages
E)   prions; viroids

Question 5

A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections. Which explanation most accurately describes the mechanism of action behind this treatment?

Accepted Answer

A)   A wide variety of bacteria cause a large percentage of human infections, producing much sickness and death.
B)   Viruses can infect bacteria, transferring pathogenic genes. The viral genes can then be suppressed, causing the bacteria to not replicate viruses.
C)   The attachment structures on the virus and the receptors on the host cells make for exquisite speci?city of viruses for particular bacterial species.
D)   Antibiotic resistance in humans is on the increase, so using a different kind of therapy is more bene?cial.

Question 6

Prophages can be activated into viral replication and enter the lytic cycle.

Accepted Answer

A) True 
 B)False

Question 7

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 8

Antiviral drugs are often diﬃcult to develop, largely because ________.

Accepted Answer

A)   viruses are more abundant in the body than bacterial cells
B)   viruses are much smaller than bacterial cells
C)   viruses are more pathogenic than bacterial cells
D)   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

Question 9

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 10

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

Question 11

The adeno-associated virus (AAV) and the delta agent are prions.

Accepted Answer

A) True 
 B)False

Question 12

Infectious naked strands of RNA that affect plants are called ______.

Accepted Answer

A)   viroids
B)   phages
C)   prions
D)   oncogenic viruses
E)   spikes

Question 13

Which of the following is not a viral order in the classiﬁcation system?

Accepted Answer

A)   Caudovirales
B)   Vaccinia virus
C)   Nidovirales
D)   Mononegavirales

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

Select the statement that most accurately describes the action of antimicrobial drugs today.

Accepted Answer

A)   Antiviral drug treatment is more effective than vaccination against a viral disease.
B)   Effective antiviral drugs have a long history of development and use.
C)   Antiviral drugs often result in toxic side effects due to their inhibition of host cell activity.
D)   The development of antiviral drug resistance has not been observed, as compared to the high rate of antibiotic resistance seen today.

Question 16

In order to synthesize proteins, a virus with a genome comprised of single-stranded negative-sense RNA _______.

Accepted Answer

A)   can directly translate its negative-sense RNA strand into proteins
B)   must use reverse transcriptase to make a negative-sense DNA strand ﬁrst
C)   must use DNA polymerase to make a positive-sense DNA strand ﬁrst
D)   must use its negative-sense strand as a template to make a positive-sense RNA

Exam 6: Viruses and Prions

Which of the following is not a viral order in the classiﬁcation system?

Correct Answer
verified

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

Correct Answer
verified

Viruses are considered ultramicroscopic because they range in size from 2 mm to 450 mm.

Correct Answer
verified

Viral tissue speci?cities are called ______.

Correct Answer
verified

In order to synthesize proteins, a virus with a genome comprised of single-stranded negative-sense RNA _______.

Correct Answer
verified

A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections. Which explanation most accurately describes the mechanism of action behind this treatment?

Correct Answer
verified

Antiviral drugs are often diﬃcult to develop, largely because ________.

Correct Answer
verified

Two noncellular agents, smaller than viruses, are infectious proteins called _ and infectious RNA strands called _.

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

Select the statement that most accurately describes the action of antimicrobial drugs today.

Correct Answer
verified

Some animals can become infected with multiple inﬂuenza virus strains usually associated with other animals. Which statement below describes the result of these infections?

Correct Answer
verified

Infectious naked strands of RNA that affect plants are called ______.

Correct Answer
verified

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

Correct Answer
verified

The adeno-associated virus (AAV) and the delta agent are prions.

Correct Answer
verified

Prophages can be activated into viral replication and enter the lytic cycle.

Correct Answer
verified

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

Correct Answer
verified

Exam 6: Viruses and Prions

Which of the following is not a viral order in the classiﬁcation system?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viruses are considered ultramicroscopic because they range in size from 2 mm to 450 mm.

Correct AnswerverifiedShow Answer

Viral tissue speci?cities are called ______.

Correct AnswerverifiedShow Answer

In order to synthesize proteins, a virus with a genome comprised of single-stranded negative-sense RNA _______.

Correct AnswerverifiedShow Answer

A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections. Which explanation most accurately describes the mechanism of action behind this treatment?

Correct AnswerverifiedShow Answer

Antiviral drugs are often diﬃcult to develop, largely because ________.

Correct AnswerverifiedShow Answer

Two noncellular agents, smaller than viruses, are infectious proteins called _____ and infectious RNA strands called _____.

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

Select the statement that most accurately describes the action of antimicrobial drugs today.

Correct AnswerverifiedShow Answer

Some animals can become infected with multiple inﬂuenza virus strains usually associated with other animals. Which statement below describes the result of these infections?

Correct AnswerverifiedShow Answer

Infectious naked strands of RNA that affect plants are called ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The adeno-associated virus (AAV) and the delta agent are prions.

Correct AnswerverifiedShow Answer

Prophages can be activated into viral replication and enter the lytic cycle.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Two noncellular agents, smaller than viruses, are infectious proteins called _ and infectious RNA strands called _.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified