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

Answer 1

Lydia Adams

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.

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Answer 2

Julian Aguilar

While all proteins have a variety of structurally-based functions in the body, including structural support, transportation, and gene expression regulation, not all proteins have the catalytic ability to catalyze biochemical reactions. Enzymes, on the other hand, are proteins with a unique three-dimensional structure that enables them to interact with substrates and facilitate chemical reactions.

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Answer from HIX Tutor

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