Virus

Question 1

Definition of a virus?

Answer 1

A non-cellular particle made up of genetic material and protein that can invade living cells

Question 2

In the structure of a virus, what parts are optional

Answer 2

Neck, and Tail

Question 3

What are viruses composed of

Answer 3

A core of Nucleic Acid

Question 4

What is the nucleic acid core surrounded by?

Answer 4

A protein coat called capsid, made from capsomere

Question 5

The Nucleic Core is made up of

Answer 5

Either DNA or RNA

Question 6

What are the size of viruses

Answer 6

0.2-0.3 µm and the biggest is 200 nm

Question 7

Where can cells be

Answer 7

Outside or Inside a cell

Question 8

How can viruses reproduce

Answer 8

Viruses can reproduce when they invade a living cell

Question 9

Ways to stop virus activity?

Answer 9

UV & X-Rays

Question 10

How can viruses act as

Answer 10

They can act as a disease agent and a genetic agent

Question 11

Each type of viruses can infect cells that are only of a limited variety from hosts. What is this called?

Answer 11

Host Range

Question 12

What are the two types of cycles viruses can go through for reproduction

Answer 12

Lytic and Lysogenic Cycle

Question 13

What phases are in a Lytic Cycle

Answer 13

Attachment/Adsorption
Injection
Synthesis
Assembly
Lyses/Release

Question 14

What phases are in a Lysogenic Cycle

Answer 14

Attachment
Injection
Combination
Replication
Synthesis
Assembly
Lyses/Release

Question 15

What do Vaccines Contain?

Answer 15

Vaccination involves putting a small amount of an inactive form of a pathogen (disease causing micro-organism) into the body.

Vaccines can contain:
- live pathogens treated to make them harmless
- harmless fragments of the pathogen
- toxins produced by pathogens
- dead pathogens

Question 16

How do Vaccines help protect you?

Answer 16

The antigens in vaccines stimulate your white blood cell to create antibodies. The antibodies destroy the antigens without any risk of you getting the disease.

And so in the future you are ready and immune to infections of the pathogens your memory cell has remembered. This is because your body can respond rapidly and make the correct antibody as if you had already had the disease.

Question 17

So if the person later becomes infected with the pathogen after getting a vaccine

Answer 17

The required lymphocytes are able to reproduce rapidly and destroy it

Question 18

For a vaccination program to be successful, it depends on

Answer 18

Herd immunity

Question 19

If the majority of a population is vaccinated, not only are those people kept safe, but viruses cannot…

Answer 19

Spread between immunized people

The immunised people provide a barrier that stops the infection from spreading to others in the group. If only a few people are vaccinated, this will help them avoid infection, but it will not protect the group.