A non-proteinaceous enzyme is

(a) lysozyme           (b) ribozyme

(c) ligase                (d) deoxyribonuclease

(b) Ribozyme is a form of ribosomal RNA (23 SrRNA) which acts as a catalyst in splicing of RNA during protein synthesis. It is the only non-protein enzyme known so far, rest all the enzymes are proteinaceous. Hence, option (b) is correct.

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