DP Biology (first assessment 2025)

Test builder »

Question 21M.2.SL.TZ2.d.ii

Select a Test
Date May 2021 Marks available [Maximum mark: 3] Reference code 21M.2.SL.TZ2.d.ii
Level SL Paper 2 Time zone TZ2
Command term Explain Question number d.ii Adapted from N/A
d.ii.
[Maximum mark: 3]
21M.2.SL.TZ2.d.ii

Explain what happens to an enzyme if there is a change of pH.

[3]

Markscheme

a. change in pH can cause a change in the tertiary structure of the enzyme
OR
enzyme denatured ✔

b. causing a change in the active site / substrate not able to bind ✔

c. the enzyme will not work as efficiently / decreased rate of reaction ✔

d. (may no longer be) the optimum/optimal pH for enzyme activity ✔

Allow answer in the form of a graph.

Syllabus sections