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The enzyme enterokinase helps in conversion of

1. trypsinogen into trypsin
2. caseinogen into casein
3. pepsinogen into pepsin
4. protein into polypeptides

Correct answer: trypsinogen into trypsin

Solution

Enterokinase (enteropeptidase) is a brush-border enzyme of the duodenum that converts trypsinogen into trypsin. Trypsin then activates several other pancreatic zymogens, making this the key initiating step.

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