DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.b

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.sl.TZ0.b
Level sl Paper 3 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
19N.3.sl.TZ0.b

Enzymes are biological catalysts.

Explain why a change in pH affects the tertiary structure of an enzyme in solution.

[2]

Markscheme

Any two of:
acidic/basic/ionizable/COOH/carboxyl/NH2/amino groups in the R groups/side chains «react» ✔
exchange/lose/gain protons/H+ ✔
change in H-bonds/ionic interactions/intermolecular forces/London dispersion forces ✔


NOTE: Do not accept “enzyme denatures” OR “change of conformation/tertiary structure” OR “substrate cannot bind to active site/binds less efficiently” as this was the answer to 8(a).

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