Chapter 19.2

Question 1

Host Range

Answer 1

Each virus has a host range, a limited number of host cells that it can infect

Question 2

The Lytic Cycle

Answer 2

The lytic cycle is a phage replicative cycle that culminates in the death of the host cell

Question 3

Virulent Phage

Answer 3

A phage that reproduces only by the lytic cycle is called a virulent phage

Question 4

Restriction Enzymes

Answer 4

Bacteria have defenses against phages, including restriction enzymes that recognize and cut up certain phage DNA

Question 5

The Lysogenic Cycle

Answer 5

The lysogenic cycle replicates the phage genome without destroying the host

Question 6

Prophage

Answer 6

Integrated viral DNA

Question 7

Temperate Phage

Answer 7

Phages that use both the lytic and lysogenic cycles

Question 8

Retroviruses

Answer 8

use reverse transcriptase to copy their RNA genome into DNA

Question 9

Retrovirus Example:

Human Immunodeficiency Virus (HIV)

Answer 9

the retrovirus that causes Acquired Immunodeficiency Syndrome (AIDS)

Question 10

Provirus

Answer 10

The viral DNA that is integrated into the host genome