AP BIOLOGY

Detailed explanation-1: -In your stomach, unique chief cells secrete digestive enzymes. One is pepsin, which breaks down proteins. Another is gastric lipase, which breaks down triglycerides.

Detailed explanation-2: -Proteins are digested in the stomach and duodenum of the small intestine. The main enzymes that catalyze protein digestion are pepsin secreted in the stomach and trypsin, chymotrypsin, and carboxypeptidase secreted from the pancreas.

Detailed explanation-3: -For proteins, it is the enzyme pepsin that digests them. Pepsin is secreted by the stomach chief cells in the stomach along with hydrochloric acid. Thus, protein digestion occurs in the stomach of the human digestive tract. Proteins are the most complex molecules and undergo further digestion in the small intestine.

Detailed explanation-4: -The digestion of protein entails breaking the complex molecule first into peptides, each having a number of amino acids, and second into individual amino acids. The pepsins are enzymes secreted by the stomach in the presence of acid that breaks down proteins (proteolysis).