<prompt> All of the following statements about Ribozymes are false, EXCEPT:They are DNA moleculesThey are not present in ribosomesThey plays a key role in RNA synthesisThey play a key role in post-transcriptional conversion of pre-mRNA to mature mRNA  <response>: Ribozymes are RNAs which exhibit highly substrate specific catalytic activity. They play a key role in the intron transcripts excision and exon transcripts splicing events essential for the conversion of pre mRNA to mature mRNA. Ribozymes catalyzed transesterification, and ultimate hydrolysis of phosphodiester bonds in RNA molecules. Ref: Textbook Of Medical Biochemistry 3Rd Edn. By S. Ramakrishnan page 338. 