Labels:crt screen | hakham | scissors OCR: BASE BASE ALTERED RIBOSE BASE BASE BASE BASE PEPTIDE NUCLEIC ACID PYRANOSYL RNA TWO MOL ECULES RELATED TO RNA have been constructed recently hydrogen atoms on carbon atoms are not shown) Pyranosyl RNA differs from RNA in that its ribose contains a six- -member, instead of five member, ring. Peptide nucleic acid has nucleic acid bases buta protein- -like backbone In prebiotic times polymers with similar features might have formed and replicated more readily than did RNA RNA might have evolved from one such molecule. PYBANOSYL
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