DP Biology (last assessment 2024)

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Question 20N.1.HL.TZ0.24

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1.HL.TZ0.24
Level HL Paper 1 Time zone TZ0
Command term Question number 24 Adapted from N/A
24.
[Maximum mark: 1]
20N.1.HL.TZ0.24

In 1940, Florey and Chain tested penicillin on bacterial infections in eight mice, before treating a sick patient. Currently, what is the correct order for testing the effectiveness of an antibiotic or other drug?

A. Affected patients, animals, healthy people

B. Animals, healthy people, affected patients

C. Healthy people, animals, affected patients

D. Animals, affected patients, healthy people

[1]

Markscheme

B

Examiners report

The basis for this question was the Nature of Science statement in the header for sub-topic 6.3. The discrimination index was very low, suggesting that some candidates who were well-prepared were not familiar with Florey and Chain’s tests. Guidance in the program for Paper 1 states this: In paper 1 there will be at least one question that addresses NOS. Candidates should therefore be prepared for a question such as this.

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