👉 In the context of biology, a zymogen is an enzyme that catalyzes a biochemical reaction. Zymogens are composed of amino acids and enzymes that catalyze the reactions that they contain. Amino acids are small molecules that can be synthesized by cells in response to various stimuli. Enzymes, on the other hand, are proteins that catalyze chemical reactions. The presence or absence of a zymogen in an organism depends on the type of enzyme it contains and the
