A-LevelBiologyEnzymes9700/12 · May/June 2016 · 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]
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.
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
B: Graph B: X with optimum around 15°C, Y with optimum around 60°C, Y having a higher maximum product concentration than X.
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