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O-LevelBiologyEnzymes5090/12 · Oct/Nov 2016 · Q41 Mark

Starch digestion occurs in the mouth cavity and in the duodenum but it stops in the stomach. Why is this?

AAll the starch has been digested before it reaches the stomach.

BCells in the stomach do not produce amylase.

CThe pH in the stomach alters the shape of the amylase.

DThe temperature in the stomach is too high for amylase to work.

✓ Correct answer

C: The pH in the stomach alters the shape of the amylase.

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About this question

Topic: Enzymes, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2016 Paper 1 Variant 2, question 4.

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