DP Biology (first assessment 2025)

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Question 21M.1A.SL.TZ1.14

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ1.14
Level SL Paper 1A Time zone TZ1
Command term Question number 14 Adapted from N/A
14.
[Maximum mark: 1]
21M.1A.SL.TZ1.14

Which statement applies to enzymes?

A. Enzyme function depends on collisions between substrate and active sites.

B. One active site typically binds to a broad range of substrates.

C. The active site on the substrate is specific to one enzyme.

D. When enzymes are immobilized they stop working.

[1]

Markscheme

A

Examiners report

This was expected to be a relatively easy question but fewer than 40 % of candidates answered it correctly. The most popular answer was incorrect substrates do not have active sites. This is a common error of understanding. The expected answer was that enzyme function depends on collisions between substrate and active site.

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