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.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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