Pepsin (D.)
Pepsin is an enzyme that break down protein to make smaller peptide, in other words, they break up polypeptidae into peptide.
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BioTeacher101
Answer: Pepsin
Explanation:
Pepsin helps in the degradation of the protein molecules that we intake in the food. Pepsin is the active protein-digesting enzyme in the stomach.
It affects by breaking the peptide bonds that holds the molecules together. The amino acids in the protein molecules are attached to each other by the help of the bond known as peptide bond.
The further digestion of protein takes place in the small intestine by the pancreatic enzyme such as trypsin, chymotrypsin et cetera.
