virus (part of microbio)

Question 1

Listeria monocytogenes

Answer 1

Gram-positive rod
L. monocytogenes targets the young and old, pregnant women, and
immunocompromised individuals; about 15% of those infected die.

Question 2

Viruses can exist

Answer 2

extracellularly or intracellularly

Question 3

extracellular viruses

Answer 3

are inactive because they possess few, if any, enzymes and cannot reproduce outside of living cells.

Question 4

intracellular viruses

Answer 4

exist primarily as replicating nucleic acids that induce the host to synthesize viral components from
which progeny virions are assembled and eventually released.

Question 5

ICTV

Answer 5

International Committee for Taxonomy of Viruses

Question 6

virion

Answer 6

complete virus particle

Question 7

Virions size

Answer 7

10 to 400 nm in diameter

Question 8

largest known virus

Answer 8

mimiviruses

Question 9

Acidianus two-tailed virus ATV

Answer 9

dsDNA
9 structural proteins
tail protein is 800 aa long
produces tails in extracellular/inert state

Question 10

nucleocapsid

Answer 10

composed of a nucleic acid,
either DNA or RNA, and a protein coat called the capsid

Question 11

function of caspid

Answer 11

protects genome + aids in transfer

Question 12

protomers

Answer 12

caspid proteins encoded by the viral genome

Question 13

tobacco mosaic virus (TMV) capsid structure

Answer 13

constructed using single type of protomer

Question 14

TMV protomer len

Answer 14

158 aa

Question 15

TMV genome

Answer 15

6400 nucleotides

Question 16

envelope

Answer 16

a lipid layer external to the nucleocapsid

Question 17

types of caspid symmetry

Answer 17

helical, icosahedral, and complex

Question 18

helical caspids

Answer 18

shaped like hollow tubes w protein walls. Ex TMV

Question 19

TMV stucture

Answer 19

rigid tube, RNA lies btwn grooves in the spiral of encoded proteins

Question 20

influenza virus enveloped?

Answer 20

true

Question 21

examples of helical

Answer 21

TMV, influeza

Question 22

Icosahedral

Answer 22

regular polyhedron with 20 equilateral tri
angular faces and 12 vertices

Question 23

enclosing efficiency of types of caspids

Answer 23

icosahedral>

Question 24

capsomers

Answer 24

ring- or knob-shaped units each usually made of pentamers or hexamers, make up the icosahedral caspids

Question 25

complex symmetry example

Answer 25

poxviruses + large bacteriophages

Question 26

icosahedral exmaple

Answer 26

adenovirus

Question 27

poxivirus virions affect

Answer 27

animal