A-LevelBiologyEnzymesMay/June 2010Paper 1 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?
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
The correct answer is A. 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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