DP Biology (last assessment 2024)

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Question 22M.2.SL.TZ1.2b

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

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].]

(b)

Outline one cause of denaturation in proteins.

[1]

Markscheme
  1. increase in temperature/heat;
  2. change of pH;
  3. salt;
  4. heavy metals;
Examiners report

Most candidates answered these questions about enzymes either really well or very poorly. Some erroneous answers mistook the active site as being separate to the enzyme or part of the substrate. Another problem had to do with temperature as a denaturant. Lowering the temperature does not denature the enzyme, though it may slow the reaction down. The candidate needed to say increased or hot temperature to gain a mark.

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