DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ2.6a

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Date May 2023 Marks available [Maximum mark: 4] Reference code 23M.2.SL.TZ2.6a
Level SL Paper 2 Time zone TZ2
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 4]
23M.2.SL.TZ2.6a
(a)

Explain how temperature affects enzymes.

[4]

Markscheme
  1. speed of reaction/catalysis increases as temperature rises;
  2. faster molecular motion so more collisions between substrate and active site;
  3. denaturation at higher temperatures;
  4. (denaturation causes) shape/conformation/structure of enzyme/active site altered/damaged;
  5. an enzyme works fastest at its optimum temperature;
  6. inactivation at lower temperatures (due to very few collisions);
  7. sketch graph to model the effect of temperature on enzyme activity;

Graphs would need to be well annotated.

Must not be bell shaped.

Syllabus sections