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QUESTION
Q72) Proteolytic enzymes do not corrode lining of alimentary canal as ...[Uttarakhand 2001 ]

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Digestive enzymes are released in inactive forms called zymogens. This is necessary to prevent the digestive enzymes from digesting the cells that produce them. In a zymogen, part of the protein blocks the active site of the enzyme. Cleaving off this peptide activates the enzyme.
Answer : (a)