structure of viruses

Question 1

what is a virus different genomes?
-give an example

Answer 1

1) most viruses just contain RNA
2) retrovirus contains both genetic material from RNA and DNA

Question 2

how do viruses encode the genes they express?
-positive sense RNA genome
-negative sense RNA genome

Answer 2

positive sense RNA genome:
message sense. and proteins can be transcribed directly. infectious

negative sense RNA genome:
anti- message snese must be transcribed into mRNA for protein translation to occur. non infectious.

Question 3

difference between non segmented and segmented virus?

Answer 3

non segmented- single genome segment of DNA/ RNA
segmented- genome divided into 3 or more segments of RNA

Question 4

what kind of proteins do viruses encode?

Answer 4

structural= proteins incorporated into the viroin. essential for virus replication.

non-structural= proteins not part of the viroin

Question 5

physical structure of a virus
-non- enveloped
-enveloped
and examples

Answer 5

non enveloped= ‘naked virus’ capside shell protects the genome e.g. dengue fever

enveloped= acquire a liquid bilayer e.g. contain spike proteins with viral glycoproteins.

Question 6

function of glycoproteins in enveloped viruses?

Answer 6

allow virues to infect other cell by binding to receptors of cells

Question 7

example of a virus with a complex structure?

Answer 7

bacteriophage T4
-virus that infect e.coli bacteria