常見(jiàn)例句雙語(yǔ)例句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.一種含氮的分子，嘌呤堿或者是嘧啶堿，它們和戊糖還有磷酸一起搆成核苷酸，核苷酸是核酸的基本結(jié)搆單位。 返回 pyrimidine nucleotide