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QUESTION
Q74) Rennin acts on ...[CBSE 1994 ]

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Stomach secretes gastric juice pH [1-3.5] which contains prorennin secreted by the zymogen cells. Inactive prorennin is converted into rennin by HCl.
Rennin acts on casein, a protein milk changing it into calcium paracaseinate, it is known as curdling of milk
Answer : (d)