Why are all enzymes are proteins, but not all proteins are enzymes?

1 Answer


Proteins is the larger set of molecules to which enzymes belong as subsets.


  • Proteins are biological macromolecules that are diverse in shape size and function.
  • Enzymes are molecules that facilitate reactions in a living cell without undergoing too much change i.e. these are biological catalysts.
  • The ability of proteins to undergo shape changes and reversibly so, make them most suited to function as enzymes among other things.
  • Other biological macromlecules like sugars and fats are less suited for such a function. Some RNA molecules serve as enzymes too . And for the same reason,too.