FIGURE 15-5 Preparing oligo-ribonudeotides. Using a combination of organic synthesis and copying by DMA polymerase I, double-stranded DMA with simple repeating sequences can be generated. RNA polymerase will then synthesize long polyribonucleotides corresponding to one or the othei OWA strand, depending on the dxjice ot ribo-nudeoside triphosphate added to the reaction mixture.

TA B L £ 15*5 Assignment of Codons Using Repeating Copolymers Built from Two or Three Nucleotides

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