O-LevelBiologyEnzymes5090/11 · May/June 2014 · Q41 Mark
A bacterium lives in hot springs at temperatures of 75°C to 85 °C. Which graph represents the activity of enzymes found in these bacteria?
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 showing enzyme activity increasing with temperature and then plateauing at high activity from ~60°C to 120°C
BGraph B showing enzyme activity plateauing at high activity from ~10°C to 120°C
CGraph C showing enzyme activity peaking at ~40°C and then decreasing rapidly
DGraph D showing enzyme activity peaking at ~80-90°C and then decreasing rapidly
✓ Correct answer
D: Graph D showing enzyme activity peaking at ~80-90°C and then decreasing rapidly
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