3.1 Communicable diseases

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Question 8
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This question is about pathogens and treatments.

A scientist investigated the effectiveness of different antibiotics on a strain of bacteria grown on agar in a Petri dish.

a.

Name one antibiotic other than penicillin.

[1]
b.

The scientist placed three paper discs containing different antibiotics (labeled X, Y, and Z) onto the agar.

A circular Petri dish containing grey agar representing a lawn of bacterial growth. Three small black circular paper discs are placed on the agar: Disc X on the right has no clear zone around it, with grey bacterial growth right up to the edge. Disc Y at the top has a small, circular white zone of inhibition around it. Disc Z on the left has a much larger circular white zone of inhibition around it.

A student stated: 'The bacterium is completely resistant to antibiotic Y.'

Explain how the results shown in the diagram prove that the student is not correct.

[2]
c.

Suggest why doctors and health organizations are concerned about the spread of antibiotic-resistant bacteria.

[2]
d.

Explain why viruses cannot be cultivated on nutrient agar.

[1]
e.

Why is it difficult for scientists to develop effective drugs that destroy viruses?

[1]
f.

Which of the following diseases is caused by a virus? Select one option:

  • Gonorrhoea
  • Tuberculosis
  • Measles
  • Salmonella
[1]

3.1 Communicable diseases Questions

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  2. /Biology
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