Textbook Chapter 9 Viruses of Archaea

Question 1

archaea are a third domain of life, distinct from what?

Answer 1

bacteria and eukaryotes

Question 2

many archaea grow and survive where?

Answer 2

in extreme environments of temperature, acidity, and salinity

Question 3

most viruses that infect archaea have what?

Answer 3

double stranded DNA genomes, some are positively supercoiled and probably have an adaption to extreme environments

Question 4

most viruses have what pertaining to appearance?

Answer 4

have envelopes and unusual morphologies with no obvious symmetry

Question 5

many viruses do not do what to the host cell?

Answer 5

kill during productive infection, their method of exit is still unknown

Question 6

in instances where the virus does the kill the cell, how does it do it?

Answer 6

they generate pyramidal structures that appear to pierce the cell wall, releasing virions and killing the host cell

Question 7

most of the genes of viruses of archaea have no what>

Answer 7

homology to known genes

Question 8

many viruses of archaea encode no obvious what?

Answer 8

DNA polymerase

Question 9

one small, double stranded DNA virus is closely related to what? what do both do?

Answer 9

closely relaed to a single stranded DNA virus and both infect hyperhalophiles