Yeast cells contain an enzyme, catalase, which catalyses the release of oxygen from the substrate hydrogen peroxide.
You will investigate the effect of temperature on the activity of catalase in yeast suspension Y.
You are provided with the materials shown in Table 1.1.

Table 1.1
labelled contents hazard volume/cm³
Y 3.0% yeast suspension none 100
H 3.0% hydrogen peroxide solution irritant 20

If any of Y or H comes into contact with your skin, wash off immediately under cold water.
It is recommended that you wear suitable eye protection.

Q: What topic does this question test?

This question tests Enzymes in A-Level Biology (syllabus code 9700). It is worth 22 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology Feb/Mar 2020 examination, Paper 3 Variant 3 (9700_m20_qp_33.pdf).

Question

Yeast cells contain an enzyme, catalase, which catalyses the release of oxygen from the substrate hydrogen peroxide.
You will investigate the effect of temperature on the activity of catalase in yeast suspension Y.
You are provided with the materials shown in Table 1.1.

Table 1.1
labelled	contents	hazard	volume/cm³
Y	3.0% yeast suspension	none	100
H	3.0% hydrogen peroxide solution	irritant	20

If any of Y or H comes into contact with your skin, wash off immediately under cold water.
It is recommended that you wear suitable eye protection.

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