The arrangements below are steps in protein digestion. Which is the correct sequence? apolypeptides, b-protein,...

Explanation

The correct sequence of steps in protein digestion is option D: b- d-a-c, which represents protein ? peptones ? polypeptides ? amino acids. Protein digestion is a process that breaks down dietary proteins into smaller components, which can be absorbed and utilized by the body. The process occurs in the following sequence: Protein: These are large complex molecules made up of long chains of amino acids. They are the starting point of protein digestion. Peptones: Proteins are first broken down into smaller fragments called peptones by the action of enzymes like pepsin in the stomach. Peptones are intermediate products in the process of protein digestion. Polypeptides: Peptones are further broken down into shorter chains of amino acids called polypeptides by the action of enzymes like trypsin and chymotrypsin in the small intestine. Amino acids: Finally, polypeptides are broken down into individual amino acids by the action of enzymes like carboxypeptidase and aminopeptidase in the small intestine. Amino acids are the end products of protein digestion and can be absorbed by the body for various functions like building and repairing tissues. In summary, protein digestion involves breaking down complex protein molecules into smaller components, starting with peptones, then polypeptides, and finally into individual amino acids that can be absorbed by the body.