胸腺嘧啶与尿嘧啶结构的差别是胸腺嘧啶尿嘧啶A.C2上有NH2C2上有O B.C5上有甲基C5上无甲基 C.C4上有NH2C4上有O D.C5上有羟甲...

作者: tihaiku 人气: - 评论: 0
问题 胸腺嘧啶与尿嘧啶结构的差别是胸腺嘧啶尿嘧啶
选项 A.C2上有NH2C2上有O B.C5上有甲基C5上无甲基 C.C4上有NH2C4上有O D.C5上有羟甲基C5上无羟甲基 E.C1上有羟基C1上无羟基
答案 B
解析

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