AIPMT PRELIMS 2011 Zoology Enzymes in Digestion MCQ Question
Which one of the following enzymes carries on the initial step in the digestion of milk in humans?
Trypsin
Pepsin
Rennin
Lipase
Correct Answer
Detailed Explanation
In humans, the milk protein digesting enzyme in the stomach is pepsin. In calves, it is rennin. Rennin is also present in small amounts in human infants but not adults. Pepsin acts on water-soluble caseinogen (milk protein) to form solubles 'casein'. This combines with calcium salts to form insoluble calcium paracaseinate, which gets readily digested enzymatically.
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