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Question 22M.2.SL.TZ1.a

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.SL.TZ1.a
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.a

The diagrams represent the structure of a protein before and after it has become denatured.

[Source: Dean Williams, L., 2019. Molecular Interactions. [online] Available at: https://ww2.chemistry.gatech.edu/~lw26/
structure/molecular_interactions/mol_int.html [Accessed 20 August 2019].]

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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