题目内容

嘧啶环中的两个氮原子来自:

A. 谷氨酰胺和氨
B. 谷氨酰胺和天冬酰胺
C. 谷氨酰胺和谷氨酸
D. 谷氨酸和氨甲酰磷酸
E. 天冬氨酸和氨甲酰磷酸

查看答案

搜索结果不匹配？点我反馈

更多问题

在体内能分解为β-氨基异丁酸的核苷酸是:

A. CMP
B. AMP
C. dTMP
D. UMP
E. IMP

体内进行嘌呤核苷酸补救合成的主要组织是

A. 脑
B. 小肠组织
C. 肝
D. 骨髓

Choose the proper words in brackets to complete the following sentence.Girls hope to receive _______ (flowers/ carnations/ roses) on St. Valentine’s Day.

Choose the proper words in brackets to complete the following sentence.He was all wet when he was back because of the _________ (rain/ downpour).