n. a long chain of linked *nucleotides, of which molecules of DNA and RNA are made.
n. a compound consisting of a nitrogen-containing base (a *purine or *pyrimidine) linked to a sugar and a phosphate group. Nucleic acids (DNA and RNA) are long chains of linked nucleotides (polynucleotide chains), which in DNA contain the purine bases adenine and guanine and the pyrimidines thymine and cytosine; in RNA, thymine is replaced by uracil.... nucleotide
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