Question

Which enzyme curdles milk by converting caseinogens into paracaseinogen?

• A. Pepsin
• B. Rennin
• C. Trypsin
• D. Lipase

Hint:

{Rennin (Chymosin)} converts {caseinogen → paracaseinogen}, causing milk coagulation in infants.

Answer 1

The Correct Option is B

Concept: Milk contains the protein caseinogen, which is soluble in milk. In infants, digestion of milk involves an enzyme called rennin (also known as chymosin). Rennin converts caseinogen into paracaseinogen, which then combines with calcium ions to form calcium paracaseinate. This reaction causes milk to curdle, allowing easier digestion of milk proteins.
Step 1: Identify the enzyme responsible for milk curdling.

• Pepsin – Digests proteins in the stomach.
• Rennin – Converts caseinogen into paracaseinogen causing milk curdling.
• Trypsin – Pancreatic enzyme for protein digestion.
• Lipase – Digests fats.

Therefore, the enzyme responsible for curdling milk is Rennin.