Antibiotic sensitivity tests can be carried out to choose appropriate antibiotics to use for treatment of bacterial diseases. A researcher carried out an antibiotic sensitivity test using two pathogenic bacteria, X and Y. The researcher prepared two Petri dishes containing agar.
• A culture of each bacterium was spread over the surface of the agar.
• Filter paper discs containing antibiotics were placed on the surface of the agar in each dish.
• The Petri dishes were incubated at 25 °C for two days.
The results of the test using three antibiotics, P, Q and R, are shown in Fig. 4.1. [Figure 4.1]

Q: What topic does this question test?

This question tests Infectious diseases in A-Level Biology (syllabus code 9700). It is worth 6 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology Oct/Nov 2020 examination, Paper 2 Variant 3 (9700_w20_qp_23.pdf).

Question

Antibiotic sensitivity tests can be carried out to choose appropriate antibiotics to use for treatment of bacterial diseases. A researcher carried out an antibiotic sensitivity test using two pathogenic bacteria, X and Y. The researcher prepared two Petri dishes containing agar.
• A culture of each bacterium was spread over the surface of the agar.
• Filter paper discs containing antibiotics were placed on the surface of the agar in each dish.
• The Petri dishes were incubated at 25 °C for two days.
The results of the test using three antibiotics, P, Q and R, are shown in Fig. 4.1. [Figure 4.1]

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