A-LevelBiologyEnzymesOct/Nov 2021Paper 1 Q151 Mark
The graph shows the relationship between the concentration of substrate and the rate of an enzyme-catalysed reaction. [Figure showing a graph of rate of enzyme-catalysed reaction vs. concentration of substrate] Which row shows how Km and Vmax for this enzyme would be affected if the same reaction was carried out in the presence of a competitive inhibitor? [Table showing changes in Km and Vmax]
AKm: increases, Vmax: decreases
BKm: increases, Vmax: remains the same
CKm: remains the same, Vmax: decreases
DKm: remains the same, Vmax: remains the same
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of enzymes within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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