Viral Classification

Question 1

What kind of genome? What enzyme used to copy?

Group I

Answer 1

ds DNA viruses

use host DNA-dependent RNA polymerase

Question 2

What kind of genome? What enzyme used to copy?

Group II

Answer 2

(+) ss DNA viruses

(+) DNA –> (-) DNA (template/compliment) –> (+) DNA copy

Question 3

What kind of genome? What enzyme used to copy?

Group III

Answer 3

ds RNA viruses

has both strands = easier replication

Question 4

What kind of genome? What enzyme used to copy?

Group IV

Answer 4

(+) ss RNA viruses

(+) ss RNA = mRNA –> (-) ss RNA (template) –> (+) ss RNA copy

uses RNA-dependent RNA polymerase

Question 5

What kind of genome? What enzyme used to copy?

Group V

Answer 5

(-) ss RNA viruses

(-) ss RNA = mRNA –> (+) ss RNA (template) –> (-) ss RNA copy

uses RNA-dependent RNA polymerase

Question 6

What kind of genome? What enzyme used to copy?

Group VI

Answer 6

(+) ss RNA retroviruses

use reverse transcriptase (RNA –> DNA)
DNA copy integrates into host’s

RNA reverse transcribing

Question 7

What kind of genome? What enzyme used to copy?

Group VII

Answer 7

ds DNA pararetroviruses

(DNA –> RNA –> DNA)
RNA intermediate

DNA reverse transcribing