Which of the following statements is valid for the enzymes' name, secretion, and the substrate upon which it acts.

(A) Ptyalin – Intestine – Maltose

(B) Pepsin – Stomach wall – Casein

(C) Ptyalin – Pancreas – Lipid CoA

(D) Chymotrypsin – Salivary gland – Lactose

The Correct Answer is (B) Pepsin – Stomach wall – Casein.


Pepsinogen is an inactive enzyme secreted by chief cells of the gastric gland.

It is converted into pepsin by the action of HCl. It is a proteolytic enzyme that degrades proteins to peptones and proteoses.

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