A-LevelBiologyEnzymesFeb/Mar 2019Paper 1 Q161 Mark
The diagram represents the reversible interaction between the active site of an enzyme and different inhibitors, X and Y. [Figure shows an enzyme with an active site, inhibitor X binding to active site, inhibitor Y binding to an allosteric site and changing active site shape] Which row correctly identifies the type of inhibition shown by inhibitor X and inhibitor Y?
AX: competitive, Y: competitive
BX: competitive, Y: non-competitive
CX: non-competitive, Y: competitive
DX: non-competitive, Y: non-competitive
✓ Correct Answer
The correct answer is B: X: competitive, Y: non-competitive
📋 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep