A nitrogenous molecule, either a PYRIMIDINE or a PURINE, that combines with a pentose sugar and phosphoric acid to form a nucleotide, the fundamental unit of nucleic acids.
一种含氮的分子,嘌呤碱或者是嘧啶碱,它们和戊糖还有磷酸一起构成核苷酸,核苷酸是核酸的基本结构单位。
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