Choose all the true statements about protein digestion and hydrolysis.

__The chemical digestion of proteins begins in the mouth with the process of mastication.

__Hydrochloric acid, present in gastric juices, causes protein denaturation.

__In the small intestine, trypsin attacks peptide bonds.

__Pancreatic juices are more acidic than gastric juices.

__Free amino acids are passively absorbed through the intestinal wall.

Answer: The true statements about protein digestion and hydrolysis are;

1. Hydrochloric acid in gastric juices cause protein denaturation.

2. In small intestine trypsin attacks peptide bonds.

3. free amino acids are absorbed by the intestinal wall.

Explanation:

Protein digestion occurs in the duodenum and stomach and it is the breakdown of proteins to amino acids by action of Enzymes like trypsin, pepsin.

Protein is digested by the hydrolysis of carbon-nitrogen bond. Mechanical digestion of protein begins in the mouth and it continues in the small intestine and stomach.

Chemical digestion starts in the stomach where by hydrochloric acid in the gastric juice denatures the protein and convert pepsinogen to pepsin enzyme which convert the protein in food to peptides. Trypsin attacks the peptide bond that involves the carboxyl group which breaks it to polypeptide. Exopepdisases and dipeptidases breaks it down to amino acids. The amino acids released by protein digestion is then absorbed by the intestinal wall