The discovery of RNA self-splicing by T. Cech (1982) and others in Tetrahymena revealed that RNA can demonstrate autonomous catalytic properties. RNAs that undergo such splicing are often called .

Explanation:

Ribozymes is a ribonucleic acid (RNA) enzyme, which is made up only by RNA.

RNA self-splicing is discovered by T. Cech (1982).

They plays very important role in protein synthesis as , they are part of ribosomes. Ribozymes also plays very important role in  RNA splicing in gene expression. RNase P.

Example:

Peptidyl transferase 23S rRNA.

Leadzyme.

Group I and II introns , and there many other ribozymes.

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