DP Biology (first assessment 2025)

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Question 21M.1A.HL.TZ1.30

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.HL.TZ1.30
Level HL Paper 1A Time zone TZ1
Command term Question number 30 Adapted from N/A
30.
[Maximum mark: 1]
21M.1A.HL.TZ1.30

Succinate dehydrogenase is an enzyme that catalyses the oxidation of succinic acid. If malonic acid is added to the mixture, the rate of reaction is reduced. An increase in succinic acid will increase the rate of reaction again. For this system, which term best describes malonic acid?

A. Substrate

B. End product

C. Non-competitive inhibitor

D. Competitive inhibitor    

[1]

Markscheme

D

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