A-LevelBiologyEnzymes9700/12 · Feb/Mar 2017 · Q141 Mark
An enzyme was added to a small excess of its substrate. All variables were kept constant. A student was asked to sketch a graph to show how the concentration of the enzyme-substrate complex changes over time. Which graph shows this correctly? [Figure 14.1]
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: concentration rises from zero, peaks, then falls to zero
BGraph B: concentration rises from zero and then plateaus
CGraph C: concentration remains constant then falls to zero
DGraph D: concentration starts high and then gradually decreases over time
✓ Correct answer
D: Graph D: concentration starts high and then gradually decreases over time
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