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Renin acts on

1. milk changing casein into calcium paracaseinate at 7.2 – 8.2 pH
2. proteins in stomach
3. fat in intestine
4. milk changing casein into calcium paracaseinate at 1 – 3 pH

Correct answer: milk changing casein into calcium paracaseinate at 1 – 3 pH

Solution

Renin (also called rennin/chymosin) acts on milk casein, converting it into calcium paracaseinate. This reaction occurs in an acidic medium, around pH 1–3, which is why the correct choice specifies milk and low pH.

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