1. Introduction to Microbiology

An infectious protein is known to cause neurodegenerative diseases in humans such as Creutzfeldt-Jakob disease ('mad cow disease'). This type of acellular infectious agent is known as a _________.

Which of the following viruses can be latent?

a. HIV

b. Chicken pox virus

c. Herpesviruses

d. All of the above

Which of the following statements is true?

a. Viruses move toward their host cells.

b. Viruses are capable of metabolism.

c. Viruses lack a cytoplasmic membrane.

d. Viruses grow in response to their environmental conditions.

Viruses:

Which of the following statements is false?

a. Viruses may have circular DNA.

b. dsRNA is found in bacteria more often than in viruses.

c. Viral DNA may be linear.

d. Typically, viruses have DNA or RNA but not both.

A virus that is specific for a bacterial host is called a __________ .

a. Phage

b. Prion

c. Virion

d. Viroid

A naked virus __________  .

a. Lacks a membranous envelope

b. Has injected its DNA or RNA into a host cell

c. Is devoid of capsomeres

d. Is one that is unattached to a host cell

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

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

Identify the viral capsid shapes.

a. ___________ <IMAGE>

b. ___________ <IMAGE>

c. ___________ <IMAGE>

d. ___________ <IMAGE>