<prompt> True about ribozymes are AECatalytic activityInvolved in transesterificationHammerhead metallo enzymeDeamination  <response>: D i.e. DeaminationRibozyme is RNA with catalytic activityQ. Examples include selfsplicing group I introns, RNase P, hammerhead metallo enzymeQ of virusoids requiring Mg2. These are involved in transesterification, phosphodiester bond hydrolysis cleavage, RNA metabolism splicing endoribonuclease, peptide bond formation peptidyl transferases and site specific RNA cleavage. 