Our by-products of cellular respiration NAD and FAD are
not stricly speaking enzymes, but coenzymes (those without carbon are called
cofactors). They are necessary to make certain enzymatic reactions occur, to activate
these reactions. Enzymes,in turn, lower activation energy on a desired reaction.
Found a very useful intro to enzymes in Britannica:
Enzyme | Definition, Mechanisms, & Nomenclature | Britannica
One recognizes enzymes by their name ending 'ase'.
Because enzymes are not consumed in the reactions they catalyze and can be used over and over again, only a very small quantity of an enzyme is needed to catalyze a reaction. A typical enzyme molecule can convert 1,000 substrate molecules per second.
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