DP Biology (first assessment 2025)

Question 20N.1A.HL.TZ0.29

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.HL.TZ0.29
Level	HL	Paper	1A	Time zone	TZ0
Command term		Question number	29	Adapted from	N/A

29.

[Maximum mark: 1]

20N.1A.HL.TZ0.29

Sulfanilamide inhibits an enzyme that catalyses a reaction involving PABA, an intermediate in the synthesis of folate in bacteria. The structures of sulfanilamide and PABA are shown.

The graph shows the rate of reaction with increasing substrate concentration and with fixed low concentration of different types of inhibitors. Which line on the graph represents the effect of sulfanilamide?

[1]

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C. Interaction and interdependence » C1.1. Enzymes and metabolism » C1.1.15. Competitive inhibition as a consequence of an inhibitor binding reversibly to an active site

Question 20N.1A.HL.TZ0.29

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