DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ2.c

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.hl.TZ2.c
Level hl Paper 3 Time zone TZ2
Command term State and explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.3.hl.TZ2.c

Proteins have structural or enzyme functions.

State and explain how a competitive inhibitor affects the maximum rate, Vmax, of an enzyme-catalyzed reaction.

[2]

Markscheme

Vmax unchanged  [✔]

at high substrate concentration substrate outcompetes inhibitor/need a higher
substrate concentration to reach Vmax  [✔]

 

Note: Accept suitable labelled diagram.

Examiners report

Many candidates stated correctly that Vmax remains unchanged but only some mentioned that a higher substrate concentration was required to reach Vmax for the second mark.

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