A-LevelBiologyEnzymesMay/June 2018Paper 1 Q131 Mark
A student carried out an investigation into the effect of temperature on the rate of an enzyme-catalysed reaction. At each temperature, the substrate concentration was measured after 10 minutes. All the other variables were kept constant. Which graph shows the effect of increasing temperature on the substrate concentration after 10 minutes?
ASubstrate concentration decreasing as temperature increases, then leveling off
BSubstrate concentration increasing, then decreasing with temperature, peaking mid-range
CSubstrate concentration increasing as temperature increases, then leveling off
DSubstrate concentration decreasing, then increasing with temperature, forming a U-shape
✓ Correct Answer
The correct answer is D. 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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