Final answer:
Exopeptidases cleave amino acids from the ends of polypeptide chains, with aminopeptidase and carboxypeptidase targeting the amino and carboxy ends respectively, while dipeptidases act on dipeptides to release free amino acids.
Step-by-step explanation:
Exopeptidases and dipeptidases are enzymes involved in the final stages of protein digestion. Exopeptidases cleave amino acids from the ends of polypeptide chains, with aminopeptidase and carboxypeptidase targeting the amino and carboxy ends respectively, while dipeptidases act on dipeptides to release free amino acids.
Exopeptidases such as aminopeptidase and carboxypeptidase cleave amino acids from the ends of polypeptide chains, with aminopeptidase targeting the amino terminal amino acids and carboxypeptidase targeting the carboxy terminal end.
On the other hand, dipeptidase specifically targets dipeptides, which are two amino acids linked together, and hydrolyses them into two free amino acids. These free amino acids are then absorbed into the bloodstream through the small intestine, completing the protein catabolism process.