Labels:bulletin board | reckoner OCR: What is more attempts to synthesize nucleotides directly from their components under prebiotic conditions have met with only modest success One encouraging series of experiments has yielded purine nudeosides that is, units consisting of ribose and purine base but not including the phosphate group that would be present ina finished nucleotide Unfortunately investigators have been unable to prodi uce pyrimidine nucl leosides (combinations of ribose with cytosine or uracil) efficiently without the aid of enzymes. Formation Of nucleotides by combining phosphate with nucleosides has been achieved by simple prebiotic reactions But the kinds of nucleotides that ocCur in nature arose along with related molecules having incorrect structures If such mixtures were produced on the young planet the abn ...
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