常見(jiàn)例句雙語(yǔ)例句The nitrogenous bases are derivatives of two parent compounds, pyrimidine and purine.核苷的含氮堿基來(lái)自兩種複郃物，嘧啶和嘌呤。www.cjcu.com.cnBase pairing The bonding relationship between purine and pyrimidine bases in the nucleotides of DNA and RNA.在DNA和RNA的核苷酸中， 嘌呤和嘧啶之間相匹配的關(guān)系。 返回 pyrimidine base