Labels:bulletin board | reckoner OCR: Both pyranosyl RNA and peptide nucleic acids rely on Watson Crick base pairs as the structural element that makes complementary pairing possible Investigators interested in discovering simpler genetic systems are also trying to build complementary molecules that op not depend on nucleotide bases for template- -directed copying So far, however, there is no good evidence that polymers constructed from such building blocks can replicate The search for antecedents of RNA can be expected to become major focus experimentation for prebiotic chemists Whether RNA arose spontaneously or replaced some earlier genetic system, its development was probably the watershed event in the development of flife. It very likely led to the synthesis of proteins, the formation of DNA and the emergence ofa cell tha ...
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