chapter 25 final

Question 1

temperate viruses are those that

Answer 1

integrate viral genes into host DNA

Question 2

a virus is a biologically active particle composed

Answer 2

of protein and nucleic acid

Question 3

lysis refers to the disintegration of

Answer 3

the host cell

Question 4

certain viruses have reverse transcriptase, an enzyme thta

Answer 4

synthesized DNA using RNA as a template

Question 5

viroids differ from viruses in their

Answer 5

absence of a capsid

Question 6

the head region of a bacteriophage is used to

Answer 6

enclose the nucleic acid

Question 7

viruses can reproduce

Answer 7

only within host cells

Question 8

the grouping of viruses is based partly on the

Answer 8

presence or absence of an envelope

Question 9

which of the following is not effective in viral disease prevention or treatment

Answer 9

antibioticis

Question 10

the lytic cycle differs from the lysogenic cycle in that

Answer 10

the lytic cycle kills the host cells and the lysoenic cycle does not kill the host cells

Question 11

enzymes in some RNA viruses

Answer 11

reverse transcriptase

Question 12

HIV integrated in host DNA

Answer 12

proviurs

Question 13

membrane structure in some viruses

Answer 13

envelope

Question 14

virus that does not replicate within its host

Answer 14

inactivated virus

Question 15

bacteriophage integrated in host DNA

Answer 15

prophage

Question 16

virus that is able to replicate but not cause disease

Answer 16

attenuated virus

Question 17

protein structure in all viruses

Answer 17

capsid

Question 18

place where a virus attaches to a host cell

Answer 18

receptor site

Question 19

thought to cause mad cow disease

Answer 19

prions

Question 20

smallest known particles that are able to replicate

Answer 20

viroids