Non-protein organic molecules such as NAD that are required for the activity of some enzymes are called
Asubstrates.
Bcoenzymes.CORRECT
Cinhibitors.
Dproducts.
JUPEBBiologyEnzymes
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Why the answer is B, and why the others tempt you.
Coenzymes are organic cofactors, often derived from vitamins, that carry chemical groups or electrons between reactions; NAD carries hydrogen in respiration. Inorganic cofactors are metal ions such as Zn$^{2+}$ or Mg$^{2+}$.
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