Chapter 8: Viruses and Fungi

Question 1

Smallest infectious agents

Answer 1

Viruses

Question 2

How do viruses differ from bacteria?

Answer 2

1) DNA or RNA genome
2) Fewer genes
3) Outer protective capsule
4) No cell membrane or wall
5) No metabolic or synthetic ability; must grow inside host cells

Question 3

What must be true for Ab to target a virus?

Answer 3

The virus must be outside the host cell.

Question 4

What are the defenses against viruses?

Answer 4

1) Interferons
2) Cell-mediated immunity (cytotoxic T-Cells)
3) Humoral immunity (if virus outside cell)
4) Antiviral agents that inhibit replication.

Question 5

True or false: Fungi have prokaryotic cells.

Answer 5

False; eukaryotic

Question 6

What are the two groups of fungi?

Answer 6

1) Yeasts

2) Molds

Question 7

What sets one up for fungal infection?

Answer 7

1) Disturbance of normal bacterial flora

2) Impaired immune defense