Viruses

Question 1

3 structural features found in all virus particles?

Answer 1

Genetic material
Capsid
Attachment protein

Question 2

What does the genetic material do?

Answer 2

Codes for viral protein

Question 3

What does the capsid do?

Answer 3

protects the genetic material

Question 4

What do attachment proteins do?

Answer 4

Binds to receptors on cells

Question 5

Why are viruses described as acellular and non-living?

Answer 5

No cell surface membrane- accellular
No metabolism/cant respire independently- non-living

Question 6

One reason why antibiotics are not effective against viruses?

Answer 6

No cell wall

Question 7

Virus replication?

Answer 7

Virus attaches to host cell using complementary receptor proteins on the host cell surface
Viral genetic material (DNA/RNA) is injected into host cell
Viral RNA is replicated using host cell’s enzymes, nucleotides and ribosomes
Viral proteins are synthesised e.g. capsid protein
New Viral proteins are assembled inside the host cell surface
Viruses are released by lysis of the host cell