One of the purines(adenine and guanine) or pyrimidines(cystosine, thymine, and uracil) that occurs attached to the sugar component of DNA or RNA.是什么意思_One of the purines(adenine and guanine) or pyrimidines(cystosine, thymine, and uracil) that occurs attached to the sugar component of DNA or RNA.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句