A-LevelBiologyEnzymesMay/June 2012Paper 1 Q131 Mark
Glucose in urine can be detected using a biochemical test. When the end of a test strip, which is impregnated with the enzyme glucose oxidase, is dipped into urine, the development of a blue colour indicates that glucose is present. This is a reliable test that people with diabetes can carry out at home. Which feature of the enzyme makes this test so reliable?
AIt is heat stable.
BIt is specific.
CIt lowers the activation energy of the reaction.
DIt only works at low pH range.
✓ Correct Answer
The correct answer is B: It is specific.
📋 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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