DP Biology (first assessment 2025)

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Question 22M.1A.SL.TZ1.8

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ1.8
Level SL Paper 1A Time zone TZ1
Command term Question number 8 Adapted from N/A
8.
[Maximum mark: 1]
22M.1A.SL.TZ1.8

The graph shows enzyme activity plotted against temperature.

 

What is the reason for the drop in enzyme activity above 40 °C?

A. A decrease in the enzyme concentration

B. Reaction is saturated because active sites are occupied

C. Insufficient activation energy for the reaction to proceed

D. Changes to the conformation of the enzyme

[1]

Markscheme

D

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