<prompt> Enterokinase is an activator of:TrypsinogenTrypsinChymotrypsinAntitrypsin  <response>: Ans. A TrypsinogenRef: Ganongy 25th ed. pg 479 Trypsinogen is converted to active enzyme trypsin by enterokinase when the pancreatic juice enters into the duodenum. Enterokinase contains 41 polysaccharide and this high polysaccharide content prevents the enterokinase from getting digested. The trypsin, chymotrypsin and elastase act at interior peptide bonds in the peptide molecules and are called as endopeptidases. 