Identify the viral capsid shapes.


a. ___________ <IMAGE>
b. ___________ <IMAGE>
c. ___________ <IMAGE>
d. ___________ <IMAGE>

Which of the following is not a criterion for specific family classification of viruses?

a. the type of nucleic acid

b. envelope structure

c. capsid type present

d. lipid composition

A clear zone of phage infection in a bacterial lawn is __________ .

a. a prophage

b. a plaque

c. naked

d. a zone of inhibition

Match each numbered term with its following description.

1. _________ uncoating

2. _________ prophage

3. _________ retrovirus

4. _________ bacteriophage

5. _________ capsid

6. _________ envelope

7. _________ virion

8. _________ provirus

9. _________ benign tumor

10. ________ cancer

A. dormant virus in a eukaryotic cell

B. a virus that infects a bacterium

C. transcribes DNA from RNA

D. protein coat of virus

E. a membrane on the outside of a virus

F. complete viral particle

G. inactive virus within bacterial cell

H. removal of capsomeres from a virion

I. invasive neoplastic cells

J. harmless neoplastic cells

Label each step in the bacteriophage replication cycle below.

a._______<IMAGE>

b._______<IMAGE>

c._______<IMAGE>

d._______<IMAGE>

Compare and contrast a bacterium and a virus by writing either “Present” or “Absent” for each of the following structures.

<IMAGE>

What is the difference between a virion and a virus particle?

Viruses:

This type of acellular infectious agent is only known to infect plants and is a small, circular, single-stranded nucleic acid molecule.