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- 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.