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Edexcel IGCSE Biology 2.11 Temperature and Enzyme Function Questions

Practise how temperature changes enzyme activity by linking faster molecular collisions near the optimum to active-site changes and loss of substrate binding at high temperatures.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • Explain why warming speeds enzyme reactions up to the optimum through more kinetic energy and collisions.
  • Explain why above the optimum, denaturation changes enzyme active-site shape so the substrate no longer fits.
  • Interpret temperature-response data from reaction rates, dough height, digestion time or clotting time.

Edexcel IGCSE Biology 2.11 Temperature and Enzyme Function Questions question 1

[Maximum number: 2]

Wheat seeds contain stores of a large insoluble molecule.
This molecule is digested by amylase as the seeds germinate.

The graph shows the results of the student's investigation.

Figure for Question Edexcel IGCSE Biology 2.11 Temperature and Enzyme Function Questions question 1 — Edexcel IGCSE Biology

Suggest why the rate of oxygen absorption is greater at 22∘C22^{\circ} \mathrm{C} than at 12∘C12^{\circ} \mathrm{C}.

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