O-LevelBiologyEnzymes5090/11 · May/June 2015 · Q101 Mark

Five tubes containing cooked egg-white are set up as shown. Protease solutions of different pH are added to each tube. [Figure 10.1] Which diagram shows the results of this experiment for a protease from the stomach?

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.

ATest tubes showing maximum digestion at pH 2.

BTest tubes showing maximum digestion at pH 5.

CTest tubes showing maximum digestion at pH 8.

DTest tubes showing maximum digestion at pH 11.

✓ Correct answer

C: Test tubes showing maximum digestion at pH 8.

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