Topic 3b - viruses

Question 1

what are virions

Answer 1

• floating free outside host cell

- called viruses once inside cell

Question 2

what are naked viruses

Answer 2

• genetic material w/ hard protein shell

- nucleocapsid only

Question 3

what are enveloped viruses

Answer 3

• naked w/ envelope

- peplomers -> spikes that touch host cell/receptor

Question 4

what are bacteriophages

Answer 4

• same as naked cell

- infect bacteria

Question 5

what are the different genetic material of viruses

Answer 5

ds RNA & ss RNA

ds DNA & ss DNA

Question 6

protein _____ (shell) composed of subunits called

Answer 6

• capsid

- capsomere proteins

Question 7

shell + genome =

Answer 7

nucleocapsid

Question 8

envelope made from

Answer 8

phospholipid bilayer (stolen pieces from host cell)

Question 9

reverse transcriptase

• function
• location

Answer 9

F: makes DNA from RNA template -> uses RNA to make complementary DNA
L: nucleocapsid

Question 10

protease

• function
• location

Answer 10

F: cuts viral multi-proteins
L: nucleocapsid

Question 11

integrase

• F
• L

Answer 11

F: connects viral genes to host genome (incorporation) to make provirus
L: nucleocapsid

Question 12

provirus

Answer 12

already on host cell genome

Question 13

RNA dependent RNA transcriptase

- F & L

Answer 13

F: uses RNA template to construct new
complementary RNA
L: nucleocapsid

Question 14

lysozyme

- F & L

Answer 14

F: digest peptidoglycan cell wall
L: base plate of bacteriophage

Question 15

bacteriophage complex capsid divided into

Answer 15

head -> genetic info

tail -> capsomeres that attach to host cell surface

Question 16

the lytic lifecycle is also called

Answer 16

• virulent (able to cause disease)

- immediate symptoms

Question 17

what life cycle does herpes virus 3 use

Answer 17

lytic and lysogenic

Question 18

lysogenic lifecycle is also called

Answer 18

• temperate

- delayed symptoms

Question 19

the lytic lifecycle happens in

Answer 19

all virus types