A-LevelBiologyEnzymesMay/June 2021Paper 2 Q411 Marks
The induced-fit hypothesis and the lock-and-key hypothesis are used to describe the mode of action of enzymes. Radish plants contain the enzyme peroxidase that catalyses the breakdown of hydrogen peroxide. Students investigated the effect of increasing the concentration of hydrogen peroxide on the activity of peroxidase extracted from radish. The results of their investigation are shown in Fig. 4.1. [Figure 4.1]
📋 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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