All enzymes are proteins,except:

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(D) Most enzymes are proteinaceous in nature. However,there are certain $RNA$ molecules that possess catalytic activity and are known as ribozymes. Ri

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Ribozyme and Ribonuclease-$P$

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(D) Most enzymes are proteinaceous in nature. However,there are certain $RNA$ molecules that possess catalytic activity and are known as ribozymes. Ribonuclease-$P$ is a well-known example of a ribozyme,which is an $RNA$ enzyme that cleaves $RNA$ molecules. Therefore,ribozyme and ribonuclease-$P$ are exceptions to the rule that all enzymes are proteins.

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