Question

Milk protein is curdled into calcium paracacinate by

• A. Maltose
• B. Rennin
• C. Trypsin
• D. Lactose

Answer 1

The correct option is B Rennin

Rennin is a proteolytic enzyme found in gastric juice of infants which helps in the digestion of milk proteins. Its action on milk is called curdling of milk. Rennin is secreted as pro rennin, which changes into active rennin in the presence of HCl. Rennin curdle milk protein caseinogens, which is hydrolysed into casein. It converts casein into solid calcium paracaseinate in presence of Ca${}^{2+}$.