Edexcel IGCSE Biology 2.11 Temperature and Enzyme Function Questions

Practise explaining how temperature changes enzyme activity, using active-site changes, collision rates and practical data patterns.

Exam points

explain faster enzyme action at warmer temperatures using kinetic energy and collisions
explain high-temperature results by denaturation and active-site shape changes
interpret graphs or data for starch digestion, dough height, respiration or clotting time

[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.

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

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