DP Biology (first assessment 2025)

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Question 21N.2.SL.TZ0.2a

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Date November 2021 Marks available [Maximum mark: 1] Reference code 21N.2.SL.TZ0.2a
Level SL Paper 2 Time zone TZ0
Command term Label Question number a Adapted from N/A
a.
[Maximum mark: 1]
21N.2.SL.TZ0.2a
(a)

The figure shows a tripeptide.

Label one peptide bond in this molecule.

[1]

Markscheme

circle/bracket around peptide bond / arrow pointing to peptide bond / peptide bond labelled;

Allow either peptide bond

Allow if adjacent C=O and NH groups are included in the circle/bracket, but do not allow if other parts of the molecule are included

Examiners report

However, in part 2b, many did not describe the functions of the named proteins correctly. Common mistakes were assuming that all hormones are proteins, with many incorrectly giving oestrogen, testosterone and thyroxin for example. Examples were anticipated from the list of proteins found in section 2.4 of the guide.

Syllabus sections