DP Biology (first assessment 2025)

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Question 21M.2.SL.TZ1.a

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Date May 2021 Marks available [Maximum mark: 3] Reference code 21M.2.SL.TZ1.a
Level SL Paper 2 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 3]
21M.2.SL.TZ1.a

Outline the structure of proteins.

[3]

Markscheme

a. protein formed from amino acids
OR
20 different amino acids ✔

b. linked together by peptide bonds ✔

c. may consist of one or more polypeptides linked together ✔

d. have a specific shape/conformation/folding ✔

e. shape determines function ✔

Examiners report

This question was attempted by about 42 % of candidates.

Many candidates used the terms primary, secondary, tertiary and quaternary as their basic outline. These terms occur in AHL but not in the core. Therefore, without an outline of the meaning of these terms few marks could be earned.

Syllabus sections