Question 1

Which body system is mainly affected by Creutzfeldt-Jakob disease?

Accepted Answer

A) digestive 
B) genitourinary 
C) nervous 
D) circulatory 
E) respiratory

Question 2

Viruses that consist of only a nucleocapsid are considered

Accepted Answer

A) simple viruses. 
B) complex viruses. 
C) naked viruses. 
D) viroids. 
E) incomplete viruses.

Question 3

How do enveloped animal viruses exit their host?

Accepted Answer

A) Budding or exocytosis 
B) Bursting the host cell 
C) Rupturing the virus 
D) Endocytosis 
E) None of these are correct

Question 4

Satellite viruses are

Accepted Answer

A) also called viroids. 
B) dependent on other viruses for replication. 
C) the cause of spongiform encephalopathies. 
D) significant pathogens of plants. 
E) All of the choices are correct.

Question 5

One of the principal capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as an _____ capsid.

Accepted Answer

The answer of One of the principal capsid shapes is...

Question 6

Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration.

Accepted Answer

A) True 
 B)False

Question 7

Which is incorrect about prophages?

Accepted Answer

A) present when the virus is in lysogeny 
B) formed when viral DNA enters the bacterial chromosome 
C) replicated with host DNA and passed on to progeny 
D) cause lysis of host cells 
E) occur when temperate phages enter host cells

Question 8

Viruses acquire envelopes around their nucleocapsids during

Accepted Answer

A) replication. 
B) assembly. 
C) adsorption. 
D) release. 
E) penetration.

Question 9

Discuss the criteria used for classifying viruses into families and genera.

Accepted Answer

The answer of Discuss the criteria used for classifying viruses...

Question 10

The virus-induced, specific damage to the host cell that can be seen in a light microscope is called

Accepted Answer

A) lysogeny. 
B) budding. 
C) plaques. 
D) cytopathic effects. 
E) pocks.

Question 11

Discuss why it is difficult to trace the origins of viruses and why they are important.

Accepted Answer

The answer of Discuss why it is difficult to trace...

Question 12

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) nucleic acid strand number.

Question 13

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

Accepted Answer

The answer of A common method for cultivating viruses in...

Question 14

Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called

Accepted Answer

A) lysogeny. 
B) budding. 
C) plaques. 
D) cytopathic effects. 
E) pocks.

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

Uncoating of viral nucleic acid

Accepted Answer

A) does not occur in bacteriophage multiplication. 
B) involves enzymatic destruction of the capsid. 
C) occurs during penetration in the multiplication cycle. 
D) occurs before replication. 
E) All of the choices are correct.

Question 17

The capsomers are made of

Accepted Answer

A) DNA. 
B) RNA. 
C) lipids. 
D) protein. 
E) carbohydrate.

Question 18

Compare and contrast viruses, prions, and viroids.

Accepted Answer

The answer of Compare and contrast viruses, prions, and viroids....

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called

Accepted Answer

A) latent 
B) oncogenic. 
C) prions. 
D) viroids. 
E) delta agents.

Exam 6: An Introduction to Viruses

Which body system is mainly affected by Creutzfeldt-Jakob disease?

Viruses that consist of only a nucleocapsid are considered

How do enveloped animal viruses exit their host?

Satellite viruses are

One of the principal capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as an _____ capsid.

Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration.

Which is incorrect about prophages?

Viruses acquire envelopes around their nucleocapsids during

Discuss the criteria used for classifying viruses into families and genera.

The virus-induced, specific damage to the host cell that can be seen in a light microscope is called

Discuss why it is difficult to trace the origins of viruses and why they are important.

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

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

Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called

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

Uncoating of viral nucleic acid

The capsomers are made of

Compare and contrast viruses, prions, and viroids.

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

Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called