CAIE IGCSE Biology 5.1.8 Effect of Changes in Temperature on Questions

Practise explaining temperature–activity data: below the optimum, higher kinetic energy increases effective enzyme–substrate collisions; above it, denaturation changes the active site.

Exam points

Explain rising enzyme activity below the optimum by linking kinetic energy to more frequent effective enzyme-substrate collisions.
Identify the optimum temperature as the temperature producing the maximum enzyme-controlled reaction rate.
Explain falling activity above the optimum through denaturation, changed active-site shape and reduced substrate fit.

[Maximum number: 3]

Table 5.1 shows the enzyme activity of alcohol dehydrogenase at different temperatures.

Table 5.1

The information in Table 5.1 shows that an increase in temperature increases the activity of alcohol dehydrogenase.

Explain why an increase in temperature causes an increase in enzyme activity.

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CAIE IGCSE Biology 5.1.8 Effect of Changes in Temperature on Questions question 1