7

Question 1

a virus is a tiny infectious

Answer 1

particle

Question 2

viruses are known to infect

Answer 2

all organisms

Question 3

nucleic acid of a virus may be

Answer 3

either DNA or RNA, never both

Question 4

general steps in the viral multiplication cycle

Answer 4

adsorption, penetration, synthesis, assembly, release

Question 5

a phrophage is a stage in the development of a

Answer 5

bacterial virus

Question 6

in general, RNA viruses multiply in the cell _________

Answer 6

cytoplasm

Question 7

DNA viruses multiply in the cell ________

Answer 7

nucleus

Question 8

viruses cannot be cultivated on

Answer 8

blood agar

Question 9

clear patches in cell cultures that indicate sites of virus infection

Answer 9

plaques

Question 10

external protective coating/shell that surrounds the nucleic acid

Answer 10

capsid

Question 11

genetic information carried by the virus particle (also known as genome)

Answer 11

nucleic acid

Question 12

capsid and nucleic acid held together

Answer 12

nucleocapsid

Question 13

modified piece of host cell membrane that covers the nucleocapsid of SOME viruses

Answer 13

envelope

Question 14

protruding glycoprotein projections of the nucleocapsid or the envelope that allow viruses to dock with their host cells

Answer 14

spike

Question 15

T/F in lysogeny, viral DNA is inserted into the host chromosome

Answer 15

true

Question 16

T/F a viral capsid is composed of subunits called virions

Answer 16

false, made of capsomeres

Question 17

T/F the envelope of an animal virus is derived from the peptidoglycan of it’s host cell

Answer 17

false, made of glycoproteins

Question 18

T/F nucleic acid of animal viruses enters the cell through a process called translocation

Answer 18

false, enters the cell through a process called penetration

Question 19

T/F viruses that persist in the host cell causes recurrent disease are called latent

Answer 19

true

Question 20

cannot be seen in a light microscope

Answer 20

viruses

Question 21

two terms to describe the shape of a virus capsid

Answer 21

helical
icosahedron

Question 22

a naked virus only has a ________

Answer 22

nucleocapsid

Question 23

T/F viral spikes are always present on enveloped viruses

Answer 23

true

Question 24

T/F every virus has an envelope

Answer 24

false

Question 25

T/F a negative RNA virus must first synthesize a positive RNA copy of it's genome

Answer 25

true

Question 26

viruses acquire envelopes around their nucleocapsid during

Answer 26

release

Question 27

the range of hosts a virus can infect in it's natural setting

Answer 27

host range

Question 28

oncogenic viruses may cause a host cell to become

Answer 28

cancerous

Question 29

viruses attach to their host via

Answer 29

host glycoproteins

Question 30

T/F viral tropism is defined by the type of cells a virus infects

Answer 30

true

Question 31

T/F chronic latent viruses that are viruses that are continuously dividing

Answer 31

false

Question 32

T/F enveloped viruses are released via budding and non-enveloped viruses are released via lysis

Answer 32

true

Question 33

T/F the viral genome includes DNA from the previous host

Answer 33

True

Question 34

phrophages cause

Answer 34

lysis of host cells

Question 35

activation of a prophage is called

Answer 35

induction

Question 36

CJD is caused by a

Answer 36

prion

Question 37

synthesizes DNA and RNA

Answer 37

polymerases

Question 38

copies RNA

Answer 38

replicases

Question 39

synthesizes DNA from RNA

Answer 39

reverse transcriptase