A-LevelBiologyEnzymes9700/12 · May/June 2018 · 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?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
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
D: Substrate concentration decreasing, then increasing with temperature, forming a U-shape
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