A-LevelBiologyEnzymesFeb/Mar 2019Paper 1 Q151 Mark
The graph shows the effect of substrate concentration on the initial rate of an enzyme-catalysed reaction. The enzyme concentration is constant. [Figure shows a graph of initial rate of reaction vs substrate concentration with points R, S, T] Which statement about the graph is correct?
ABetween R and S the number of enzyme molecules is limiting the rate of reaction.
BBetween R and S the number of product molecules is limiting the rate of reaction.
CBetween S and T the number of enzyme molecules is limiting the rate of reaction.
DBetween S and T the number of substrate molecules is limiting the rate of reaction.
✓ Correct Answer
The correct answer is C. 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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