Concept:Many powerful digestive proteases are synthesized as inactive precursors (zymogens) to prevent them from destroying the cells that created them. They require a regulatory molecule to cleave and activate them.
Solution:- Pepsinogen (activated by HCl), Trypsinogen (activated by enterokinase), and Chymotrypsinogen (activated by trypsin) are all inactive zymogens (indicated by the '-ogen' suffix).
- Erypsin, however, is a collective term for a mixture of specific peptidases found in intestinal juice that are already active and do not require a separate regulatory molecule to unmask their active sites.
Why other options are incorrect:Pepsinogen, trypsinogen, and chymotrypsinogen are classic examples of enzymes that are absolutely dependent on regulatory cleavage for activation.
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