Shown below is an R loop prepared for electron microscopy by annealing a purified eukaryotic messenger RNA with DNA from a genomic clone containing the full-length gene corresponding to the mRNA. (a) How many exons does the gene contain? How many introns? (b) Where in this structure would you expect to find a 5',5'-internucleotide bond? Where would you expect to find a polyadenylic acid sequence?

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