polynucleotide nucleic acid A macromolecule made up of nucleotide units and hydrolysable into certain pyrimidine or purine bases (usually adenine, cytosine, guanine, thymine, uracil), D-ribose or 2-deoxy-D-ribose and phosphoric acid. CHEBI:33696 NA Nukleinsaeure Nukleinsaeuren acide nucleique acides nucleiques acido nucleico acidos nucleicos chebi_ontology nucleic acids