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单项选择题

6-巯基嘌呤作为抗肿瘤药物主要是因为其与下列哪种化合物结构类似
A 叶酸
B 次黄嘌呤
C 谷氨酰胺
D 天冬氨酸
E 嘧啶碱基

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热门试题

单项选择题（5-3）探讨工程职业所面临的有争议的伦理问题的恰当的场所是( )。

A．工程师之家
B．政府机构
C．职业社团
D．行业

单项选择题Which of the following are common confusions students encounter in their relationship with advisor?

A．. Thinking that the advisor sets the objectives of the research
B．. Assuming that working independently means you have to do everything alone
C．. Expecting your advisor to give you constructive criticism on your work
D．. All of the above