Which enzyme digests protein ?

Question

Accepted Answer

The correct option is (2):
Trypsin is a crucial digestive enzyme that plays a primary role in the chemical breakdown of proteins. It is secreted by the pancreas into the small intestine, initially as an inactive precursor called trypsinogen, which is then activated to its functional form, trypsin. As a member of the **protease** family of enzymes, its specific function is to hydrolyze (break down) the peptide bonds within large protein molecules, converting them into smaller peptide chains and ultimately into free amino acids. This final breakdown is essential because only the smallest forms, like amino acids, can be absorbed through the intestinal walls and utilized by the body for muscle building, tissue repair, and other vital functions.

The incorrect option is (1):
Amylase is an enzyme dedicated solely to the digestion of carbohydrates. It is produced in two main locations: the salivary glands (salivary amylase) and the pancreas (pancreatic amylase). Its role is to break down complex carbohydrates like starch into simpler sugars (such as maltose and glucose). Since its specific substrate is carbohydrate and not protein, it cannot be the enzyme that digests protein.

The incorrect option is (3):
Lipase is the primary enzyme responsible for the digestion of dietary fats, or lipids. It works primarily in the small intestine, where it hydrolyzes fat molecules into fatty acids and glycerol. These smaller components can then be readily absorbed by the body. As the enzyme's function is fat breakdown, it is not involved in the chemical digestion of protein.

The incorrect option is (4):
The statement "None of the above" is factually incorrect in the context of this question. Trypsin is a major and highly effective protein-digesting enzyme, and therefore, an accurate answer is already provided among the choices.