VIRUS

Question 1

Why can viruses not produce alone?

Answer 1

Because they have no chemical processes of their own.

Question 2

What is the FIRST process of virus replication?

Answer 2

Absorption: Virus enters through a cavity or broken surface of an organism, once inside it finds a host cell to infect.

Question 3

What is the SECOND process of virus replication?

Answer 3

Entry: The virus attaches to a specific cell type and ‘injects’ its genetic materia into the cell.

Question 4

What is the THIRD process of virus replication?

Answer 4

Replication: The viruses genetic material (DNA) instructs to the cell DNA and cell machinery to produce copies of the virus DNA. (Viral protein is made).

Question 5

What is the FOURTH process of virus replication?

Answer 5

Assembly: Various pieces of viral protein are constructed into individual viral particles (or virions), assembled into new viruses.

Question 6

What is the FIFTH and LAST process of virus replication?

Answer 6

Release: The host cell ruptures (killing it) and releasing many viruses which can affect other cells.

Question 7

Why can viruses not be grown on agar plates?

Answer 7

Because Agar Jelly is not a living medium.

Question 8

What THREE requirements must be met to ensure the successful infection of a virus?

Answer 8

1. Sufficient virus must be present
2. The cells must be susceptible and permissive (matchinf) to the virus
3. Local defences (immune system) must be absent.

Question 9

What can viruses produce in?

Answer 9

Fertile hen’s eggs.

Question 10

What is the term “Inoculation”?

Answer 10

The introduction of micro-organisms onto agar or into living cells.

Question 11

What is the function of