Final answer:
The enzymes pepsin, chymotrypsin, trypsin, and carboxypeptidase all participate in protein digestion by breaking down proteins into smaller peptides and amino acids.
Step-by-step explanation:
The enzymes pepsin, chymotrypsin, trypsin, and carboxypeptidase have a common function in protein digestion. They are all enzymes that participate in breaking down proteins into smaller peptides and amino acids.
Pepsin is secreted and active in the stomach, where it breaks down proteins into peptides. Chymotrypsin, trypsin, and carboxypeptidase are pancreatic enzymes that are secreted and active in the small intestine. They further break down peptides into smaller peptides and amino acids.