A-LevelBiologyEnzymesMay/June 2019Paper 1 Q81 Mark
In enzyme-catalysed reactions, the position of the amino acids found at the active site is important. During the synthesis of enzymes, amino acids are brought together in the correct position to form the active site. Which levels of protein structure must be involved in forming the active site?
Aprimary: ✓, secondary: ✓, tertiary: ✓, quaternary: ✓
Bprimary: ✓, secondary: ✓, tertiary: ✓, quaternary: x
Cprimary: x, secondary: ✓, tertiary: ✓, quaternary: x
Dprimary: x, secondary: ✓, tertiary: ✓, quaternary: ✓
✓ Correct Answer
The correct answer is B: primary: ✓, secondary: ✓, tertiary: ✓, quaternary: x
📋 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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