Zymogen is

🔑 Key Points
→ A zymogen, also called a proenzyme, is an inactive precursor of an enzyme.
→ Any group of proteins that display no catalytic activity but are transformed within an organism into enzymes, especially those that catalyze reactions involving the breakdown of proteins, are zymogen.
→ A zymogen requires a biochemical change for it to become an active enzyme.
→ The biochemical change usually occurs in Golgi bodies, where a specific part of the precursor enzyme is cleaved in order to activate it.

🔴 Additional Information:
→ Enzyme poisons are basically enzyme inhibitors.
→ Enzymes have a wide variety of many important functions in any biological system, which makes life possible.
→ Any substance which can inhibit their activity and cause a loss to biological processes, which may be life-threatening, are enzyme poisons or enzyme inhibitors.