Will reward !

in a biological reaction involving an enzyme, what does not directly participate in the reaction?

a. the inactive site of an enzyme

b. the reactant chemicals

c. the active site of the substrate

d. the active site of an enzyme

A substance that speeds up a chemical reaction—without being a reactant—is called a catalyst. The catalysts for biochemical reactions that happen in living organisms are called enzymes. Enzymes are usually proteins, though some ribonucleic acid (RNA) molecules act as enzymes too.Enzymes perform the critical task of lowering a reaction's activation energy—that is, the amount of energy that must be put in for the reaction to begin. Enzymes work by binding to reactant molecules and holding them in such a way that the chemical bond-breaking and bond-forming processes take place more readily. Now let me quite before my fingers fall off. I should have answered your question in that huge speech

What is the example? i’ll be happy to answer if you can tell me : )

Covalent bond is the correct answer