Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Oncogenic viruses include all the following except ______.

Accepted Answer

A)   hepatitis B virus
B)   measles virus
C)   Papillomavirus
D)   HTLV-I and HTLV-II viruses
E)   Epstein-Barr virus

Question 3

Which of the following is not associated with every virus?

Accepted Answer

A)   Envelope
B)   Capsomeres
C)   Capsid
D)   Nucleic acid
E)   Genome

Question 4

Host range is limited by the

Accepted Answer

A)   type of nucleic acid in the virus.
B)   age of the host cell.
C)   type of host cell receptors on cell membrane.
D)   size of the host cell.

Question 5

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 6

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Accepted Answer

A)   embryo
B)   cell
C)   plaque
D)   bacteriophage
E)   egg

Question 7

Reverse transcriptase synthesizes

Accepted Answer

A)   a positive RNA strand from a negative RNA strand.
B)   a negative RNA strand from a positive RNA strand.
C)   viral RNA from DNA.
D)   viral DNA from RNA.

Question 8

Viruses that infect bacteria are specifically called ______.

Accepted Answer

A)   viroids
B)   prions
C)   bacteriophages
D)   satellite viruses

Question 9

Viruses exhibit all the following except ______.

Accepted Answer

A)   definite shape
B)   metabolism
C)   genes
D)   ability to infect host cells
E)   ultramicroscopic size

Question 10

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 11

Cells grown in culture form a/an ______.

Accepted Answer

A)   monolayer
B)   bilayer
C)   aggregate
D)   plaque

Question 12

Which of the following is/are type(s) of cytopathic effects?

Accepted Answer

A)   Inclusions in the nucleus
B)   Multinucleated giant cells
C)   Inclusions in the cytoplasm
D)   Rounding of cells
E)   All of the choices are correct.

Question 13

Viral spikes

Accepted Answer

A)   are always present on enveloped viruses.
B)   attach the viral capsid and envelope.
C)   allow bacteria to evade host defenses.
D)   are derived from host proteins.
E)   are for recognition among the various types of viruses.

Question 14

Viral nomenclature uses the same system as living organisms; a genus and specific epithet is designated for each virus.

Accepted Answer

A) True 
 B)False

Question 15

Mammalian viruses capable of starting tumors are ______.

Accepted Answer

A)   chronic latent viruses
B)   oncoviruses
C)   syncytia
D)   inclusion bodies

Question 16

Viral nucleic acid types include which of the following?

Accepted Answer

A)   Double-stranded DNA
B)   Single-stranded DNA
C)   Double-stranded RNA
D)   Single-stranded RNA
E)   All of the choices are correct.

Question 17

The core of every virus particle always contains ______.

Accepted Answer

A)   DNA
B)   capsomeres
C)   enzymes
D)   DNA and RNA
E)   either DNA or RNA

Question 18

A naked virus only has a/an ______.

Accepted Answer

A)   capsomere
B)   nucleocapsid
C)   envelope
D)   antigenic surface

Question 19

Tamiflu is a common medication given for influenza treatment.It works by protecting and blocking sialic acid molecules on the surfaces of host cells and influenza virus envelopes as they leave the cell.Which statement reflects the mechanism of Tamiflu's action?

Accepted Answer

A)   Tamiflu blocks protein synthesis of the viral genome.
B)   Tamiflu interferes with the replication of +ssRNA from the -ssRNA genome of the flu virus.
C)   Tamiflu interferes with the release of the budding viruses from the infected host cells.
D)   Tamiflu interferes with the metabolic properties of the virus.

Question 20

Viral classification has changed over the years and while they are given genus names,the use of species names has not been widely accepted.This is because

Accepted Answer

A)   viruses are not organisms.
B)   viruses change over time making species characteristics difficult to stabilize.
C)   viruses that could be classified into a single species may have many, but not all, properties in common.
D)   All of the above are arguments against using species designations for viruses.

Exam 6: An Introduction to the Viruses

Viruses that infect bacteria are specifically called ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Tamiflu is a common medication given for influenza treatment.It works by protecting and blocking sialic acid molecules on the surfaces of host cells and influenza virus envelopes as they leave the cell.Which statement reflects the mechanism of Tamiflu's action?

Correct AnswerverifiedShow Answer

A naked virus only has a/an ______.

Correct AnswerverifiedShow Answer

Viral spikes

Correct AnswerverifiedShow Answer

Mammalian viruses capable of starting tumors are ______.

Correct AnswerverifiedShow Answer

Oncogenic viruses include all the following except ______.

Correct AnswerverifiedShow Answer

Viral nomenclature uses the same system as living organisms; a genus and specific epithet is designated for each virus.

Correct AnswerverifiedShow Answer

The core of every virus particle always contains ______.

Correct AnswerverifiedShow Answer

Which of the following is not associated with every virus?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viral nucleic acid types include which of the following?

Correct AnswerverifiedShow Answer

Viruses exhibit all the following except ______.

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

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Correct AnswerverifiedShow Answer

Cells grown in culture form a/an ______.

Correct AnswerverifiedShow Answer

Viral classification has changed over the years and while they are given genus names,the use of species names has not been widely accepted.This is because

Correct AnswerverifiedShow Answer

Which of the following is/are type(s) of cytopathic effects?

Correct AnswerverifiedShow Answer

Host range is limited by the

Correct AnswerverifiedShow Answer

Reverse transcriptase synthesizes

Correct AnswerverifiedShow Answer

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