A-LevelBiologyEnzymesMay/June 2016Paper 1 Q111 Mark
Two enzymes, X and Y, were used in an experiment. Enzyme X was from bacteria that live in rivers and lakes at temperatures from 5°C to 20 °C. Enzyme Y was from bacteria that live in hot water springs at temperatures from 40°C to 85 °C. The experiment measured the concentration of product produced by each enzyme at temperatures between 0°C and 100°C after 5 minutes. Which graph shows the results? [Figure 11.1]
AGraph A: X with optimum around 15°C, Y with optimum around 60°C, similar maximum product concentrations.
BGraph B: X with optimum around 15°C, Y with optimum around 60°C, Y having a higher maximum product concentration than X.
CGraph C: X with optimum around 15°C, Y showing product concentration linearly increasing with temperature.
DGraph D: Both X and Y showing product concentration linearly increasing with temperature, Y higher than X.
✓ Correct Answer
The correct answer is B. 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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