DP Biology (first assessment 2025)

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Question 19N.1A.SL.TZ0.10

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.1A.SL.TZ0.10
Level SL Paper 1A Time zone TZ0
Command term Deduce Question number 10 Adapted from N/A
10.
[Maximum mark: 1]
19N.1A.SL.TZ0.10

What effect do changes in pH have on enzymes?

A. All enzymes increase in activity as pH increases.

B. The activity of all enzymes is reduced by a pH below or above 7.

C. Low pH causes reversible denaturation in all enzymes.

D. Extreme pH can alter the active site of all enzymes.

[1]

Markscheme

D

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