DP Biology (first assessment 2025)

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Question 22M.2.SL.TZ1.2a

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.SL.TZ1.2a
Level SL Paper 2 Time zone TZ1
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
22M.2.SL.TZ1.2a
(a)

State how many different types of amino acid there are, which can become part of a polypeptide when mRNA is translated.

[1]

Markscheme

20;

Examiners report

Amazingly, most candidates missed gaining the mark for this question: a huge variety of incorrect numbers appeared, "4" was most frequent. Many candidates seemed to confuse the 4 nucleotide bases with the 20 amino acids.

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