Multiple choice

The principal action of the enterokinase present in the human intestinal juice is to-

  1. Hydrolyse casein into paracasein

  2. Act of the terminal peptide bond of peptide chain to release the last amino acid.

  3. Convert pro-carboxypeptidase to carboxypeptidase

  4. Activate the trypsinogen of the pancreatic juice.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Enterokinase (also called enteropeptidase) is a protease enzyme produced in the duodenum. Its primary and most important function is to activate trypsinogen (the inactive precursor) into trypsin by cleaving off an activation peptide. Trypsin then activates other pancreatic zymogens (procarboxypeptidase, chymotrypsinogen, etc.) creating a digestive enzyme cascade. Options A, B, and C describe functions of other enzymes.

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