DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.8a

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.sl.TZ0.8a
Level sl Paper 3 Time zone TZ0
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
19N.3.sl.TZ0.8a

Enzymes are biological catalysts.

(a)

The graph shows the relationship between the temperature and the rate of an enzyme-catalysed reaction.

State one reason for the decrease in rate above the optimum temperature.

[1]

Markscheme

enzyme denatures
OR
change of conformation/shape of active site
OR
substrate cannot bind to active site/binds less efficiently ✔

NOTE: Accept “change in structure” or “substrate doesn't fit/fits poorly into active site”

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