Disease examples

Question 1

Describe how HIV can lead to AIDS.

Answer 1

HIV destroys cells involved in the immune response.
The immune system becomes so damaged it can’t cope with other infections and cancers

Question 2

Name one symptom of gonorrhoea and one way its spread can be prevented

Answer 2

Symptom – Any one from:

Thick green or yellow discharge.
Pain while urinating.

Prevention method – Any one from:

Use barrier methods (e.g. condoms).
Not having sex or only having sex with uninfected people.
Treating infected people with antibiotics.

Question 3

Name two similarities and two differences between tobacco mosaic virus (TMV) and rose black spot disease.

Answer 3

Similarities – Any two from:

Both affect plants.
Both cause discolouration of the leaves.
Both prevent plant growth due to limiting photosynthesis.

Differences – Any two from:

TMV is caused by a virus, rose black spot disease is caused by a fungus.
TMV affects lots of different plants including tomatoes, rose black spot disease affects rose plants.
TMV causes a mosaic pattern, rose black spot disease causes spots.