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Evidence for Dna and Its Uses Essay Preview: Evidence for Dna and Its Uses Report this essay Evidence for DNA & its uses Nucleic Acids RNA is composed of nucleotides, but differs from DNA in that The pyrimidine base, uracil, replaces the base thymine. When intramolecular (RNA-RNA) or intermolecular (t-RNA–m-RNA or DNA-RNA) base pairing occurs.