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Which one of the following enzymes carries out the initial step in the digestion of milk in humans?

1. Pepsin
2. Renin
3. Lipase
4. Trypsin

Correct answer: Renin

Solution

Renin (more precisely rennin/chymosin) is the enzyme that initiates milk digestion by curdling casein in the stomach, especially in infants. This coagulation slows milk passage and allows further digestion by other enzymes.

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