DP Biology (first assessment 2025)

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Question 21M.1A.SL.TZ1.10

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ1.10
Level SL Paper 1A Time zone TZ1
Command term Question number 10 Adapted from N/A
10.
[Maximum mark: 1]
21M.1A.SL.TZ1.10

Which molecule is depicted in the diagram?

A. A saturated fatty acid

B. An unsaturated fatty acid

C. A trans fat

D. A vegetable oil

[1]

Markscheme

A

Examiners report

About two thirds of candidates answered this question correctly, but the discrimination index was surprisingly low. Some of the stronger candidates thought that the molecule depicted was an unsaturated fatty acid, perhaps because of the double bond in the carboxyl group. It is only in the hydrocarbon chain that a double bond indicates an unsaturated fatty acid.

Syllabus sections