A-LevelBiologyEnzymesMay/June 2021Paper 5 Q118 Marks
The enzyme catalase catalyses the reaction shown in Fig. 1.1. catalase hydrogen peroxide → water + oxygen [Figure 1.1] A student had read that copper(II) sulfate can act as an inhibitor, reducing the activity of catalase. The student wanted to investigate the effect of copper(II) sulfate as an inhibitor on the activity of catalase to test the hypothesis: The higher the concentration of the inhibitor copper(II) sulfate, the lower the volume of oxygen produced in the presence of catalase.
📋 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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