Viruses

Question 1

Viruses are said to ……. …….. parasites

Answer 1

Obligate intracellular parasites

Question 2

-RNA can serve as mRNA. True or false?

Answer 2

False. +RNA is identical to mRNA. -RNA requires reverse transcriptase.

Question 3

What is the capsid of a virus?

Answer 3

It is the outer protein coat. It protects the viral genome and may be involved in attachment to host cells. It is composed of individual subunits called capsomers.

Question 4

Successful viral replication requires …….. infection and …… host cell

Answer 4

Productive infection and permissive host cell

Question 5

What are cytopathic effects?

Answer 5

Visible effects on the host cell caused by viral replication

Question 6

What is an example of a DNA, non-enveloped virus?

Answer 6

HPV

Question 7

What is an example of an RNA enveloped virus?

Answer 7

HIV

Question 8

What is an example of a DNA enveloped virus?

Answer 8

Herpes

Question 9

What is an example of an RNA non-enveloped virus?

Answer 9

Polio

Question 10

What are inclusion bodies?

Answer 10

Sites of active virus synthesis

Question 11

What is syncytia formation?

Answer 11

Giant, multi nucleated cells formed by the fusion of plasma membranes

Question 12

What are the Henle-Koch postulates?

Answer 12

• Agent must be present in every case
• Agent must not be found in other cases of disease
• Once isolated must be recovered from teh experimental disease produced

Question 13

What are the two basic capsid shapes?

Answer 13

Icosahedral + helical