CAIE IGCSE Biology 5.1.8 Effect of Changes in Temperature on Questions

Practise explaining temperature–activity curves through kinetic energy and effective collisions below the optimum, then active-site denaturation above it.

Exam points

explain rising activity below the optimum through greater kinetic energy and more effective collisions
identify the optimum as the temperature producing the maximum enzyme-controlled reaction rate
explain falling activity above the optimum through denaturation and loss of complementary active-site shape

[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