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Which one of the following is a matching pair of a substrate and its particular digestive enzyme?

1. Starch — maltase
2. Lactose — rennin
3. Maltose — steapsin
4. Casein — chymotrypsin

Correct answer: Casein — chymotrypsin

Solution

Chymotrypsin is a protease, so it digests proteins such as casein. The other pairs mismatch substrate type and enzyme function: maltase acts on maltose, rennin acts on milk proteins, and steapsin is a lipase for fats.

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