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Date May 2022 Marks available 1 Reference code 22M.1.HL.TZ2.6
Level Higher level Paper Paper 1 Time zone Time zone 2
Command term Question number 6 Adapted from N/A

Question

The diagram shows the structure of the protein CXCL12.

[Source: Lu, J., Chatterjee, M., Schmid, H. et al. CXCL14 as an emerging immune and inflammatory modulator.
J Inflamm 13, 1 (2016). https://doi.org/10.1186/s12950-015-0109-9 Distributed under the terms of the
Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).]

 

Which chemical group is found at X?

A. NH2

B. NOH

C. COH

D. COOH

Markscheme

D

Examiners report

[N/A]

Syllabus sections

Core » Topic 2: Molecular biology » 2.4 Proteins
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