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QUESTION
Q517) The initial step in the digestion of milk in humans is carried out by ? …[AIPMT 2014]

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In humans, the milk protein digesting enzyme in stomach is pepsin. In calves it is rennin. It is also present in small amounts in human infants but not adults. Pepsin acts on water soluble 'caseinogen' (milk protein) to form soluble 'casein' This combines with calcium salts to form insoluble calcium paracaseinate, which gets readily digested enzymatically.
Answer:(b)