unit 2, viruses

Question 1

what’s common with all viruses

Answer 1

•a-cellular, not living
•can’t reproduce themselves
•20-200nm
•much smaller than eukaryotic and prokaryotic

Question 2

How do viruses replicate ?

Answer 2

•recognises and attaches to host
•nucleic acid (RNA and DNA) is injected into host cell
• viral nucleic acts as information so host now makes viral components ( nucleic acid, enzymes, structural components)
• new virus made ( inside cell)
•cell burst open and releases virus

Question 3

how do viruses invade specific cells

Answer 3

•attachment proteins bind to complementary receptor proteins
•different proteins have different receptor cells, which require different host cells

Question 4

what is the envelope made out of

Answer 4

not present in all viruses , made of lipid

Question 5

envelope protein characteristics

Answer 5

allows viruses to identify and attach to host cells

Question 6

what does the capsid do

Answer 6

it is a protein coat , it surrounds and encloses nucleic acid