AP BIOLOGY

Detailed explanation-1: -Digestion of proteins starts in stomach by the action of gastric juice produced by the walls of the stomach. Digestion of protein also takes place in duodenum and ileum by the action of pancreatic and intestinal juice .

Detailed explanation-2: -Protein digestion begins when you first start chewing. There are two enzymes in your saliva called amylase and lipase. They mostly break down carbohydrates and fats. Once a protein source reaches your stomach, hydrochloric acid and enzymes called proteases break it down into smaller chains of amino acids.

Detailed explanation-3: -Digestion of proteins occurs in stomach. Enzyme pepsin digests proteins into peptides.

Detailed explanation-4: -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.