A-LevelBiologyEnzymes9700/12 · Oct/Nov 2012 · Q141 Mark
Two enzyme experiments were carried out. The first, experiment X, was carried out at a temperature of 37°C. During the second experiment the temperature was increased from 37°C to 80°C. All other factors were kept the same. Which graph shows the results?
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AGraph showing product concentration over time where X (37°C) has a steady increase and then plateaus, and the 80°C line starts lower, increases rapidly, then plateaus at the same level as X.
BGraph showing product concentration over time where X (37°C) has a steady increase and then plateaus, and the 80°C line shows a rapid increase then sharp decrease, reaching zero.
CGraph showing product concentration over time where X (37°C) has a rapid increase and then plateaus, and the 80°C line starts lower and then plateaus at the same level.
DGraph showing product concentration over time where X (37°C) has a rapid increase and then plateaus, and the 80°C line also increases rapidly then decreases.
✓ Correct answer
A: Graph showing product concentration over time where X (37°C) has a steady increase and then plateaus, and the 80°C line starts lower, increases rapidly, then plateaus at the same level as X.
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