Tyrosinase is an enzyme that catalyses the conversion of the amino acid tyrosine into the black pigment melanin. It is responsible for the black fur colour of some rabbits. A group of rabbits kept at 30°C resulted in 90% of the rabbits with light fur colour. A second group of rabbits kept at 10°C resulted in 90% of the rabbits with black fur colour. Which hypothesis is supported by these results?
✓ Correct Answer
The correct answer is A: An inhibitor is present in rabbit skin cells that can bind strongly to tyrosinase when the external temperature is 30°C.
📋 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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