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A-LevelBiologyEnzymesOct/Nov 2023Paper 3 Q121 Marks

You will investigate the effect of temperature on the production of carbon dioxide gas by yeast cells. Yeast cells contain enzymes that break down glucose to release carbon dioxide and ethanol as shown in Fig. 1.1. enzymes in yeast cells glucose → carbon dioxide + ethanol [Figure 1.1] You are provided with the materials shown in Table 1.1. Table 1.1 labelled | contents | hazard | volume/cm³ Y | yeast cell suspension | none | 100 G | glucose solution | none | 20 H | hydrogencarbonate indicator | harmful irritant | 15 If any solution comes into contact with your skin, wash off immediately under cold water. It is recommended that you wear suitable eye protection. You will need to: • maintain samples of a yeast cell suspension at different temperatures • count the number of bubbles of carbon dioxide produced.

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About This A-Level Biology Question

This structured question appeared in the Cambridge A-Level Biology (9700) Oct/Nov 2023 examination, Paper 3 Variant 1. It tests the topic of Enzymes and is worth 21 marks.

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