A-LevelBiologyEnzymes9700/12 · May/June 2010 · Q241 Mark
An enzyme is completely denatured at 50 °C. A fixed concentration of this enzyme is added to a fixed concentration of its substrate. The time taken for completion of the reaction is measured at different temperatures. Which graph shows the results?
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.
A[Graph A showing reaction time high at low temp, decreasing to a minimum, then increasing sharply to infinity at 50°C, and staying infinite]
B[Graph B showing reaction time decreasing, then increasing with temperature, but not indicating 50°C as a hard denaturing point]
C[Graph C showing reaction time decreasing to a minimum, then slowly increasing with temperature]
D[Graph D showing reaction time decreasing to a minimum, then increasing with temperature, but not sharply to infinity at 50°C]
✓ Correct answer
A: [Graph A showing reaction time high at low temp, decreasing to a minimum, then increasing sharply to infinity at 50°C, and staying infinite]
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