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B
Casein into paracasein
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C
Caseinogen into paracasein
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D
Paracasein into carcinogen
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Solution
The correct option is B Casein into paracasein
Rennin is a proteolytic enzyme found in gastric juice of infants.
This enzyme causes coagulation of milk and is important in the digestive processes of infants because it prevents the rapid passage of milk from the stomach.
In the presence of calcium, rennin changes irreversibly the casein of milk to a paracasein which is then acted upon by pepsin. Hence, Rennin acts on milk proteins and converts Casein into paracasein.
So, the correct answer is 'Casein into paracasein'.