Labels:bulletin board | reckoner OCR: So far no RNA molecules that direct the replicatior other RNA molecules have beer identified in nature But ingen ious techniques devised by Cech and Jack W Szostak of the Massachusetts General Hospital have modified naturally occurring ribozymes so that they can carry out some of the most important subreactions of RNA replication such as stringing together nucleotides or oligonucleotides (short sequences Of nucleotides) Quite recently Szostak found even stronger evidence that an RNA molecule produced by prebiotic chemistry could have carried out RNA replication on the early earth He started by creating a pool of random oligonucleotides, to approximate the random production presumed to have occurred some four billion years ago From that pool he was able to isolate catalyst that could join t ...
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