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T4DNA连接酶的作用机制有哪些?
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下列关于DNA连接酶叙述错误的是()A、EcoliDNA连接酶来自大肠杆菌,只能连接粘性末端B、T4DNA连接酶来自T4噬菌体,既能连接粘性末端,也能连接平末端C、T4DNA连接酶连接平末端和粘性末端效率一样D、DNA连接酶是“分子缝合针”
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单选题假定有如下的Sub过程: SubS (x As Single, y As Single) t = x x = t / y y = t Mod y End Sub 在窗体上添加一个命令按钮,然后编写如下事件过程: Private Sub Command1_Click( ) Dim a As Single Dim b As Singlea = 5: b = 4 S a, b Print a, b End Sub 程序运行时,单击命令按钮得到的结果()。A
54B
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单选题A
pIsub2/sub=Isub3/sub/pB
pIsub2/sub=4Isub3/sub/pC
pIsub2/sub=2Isub3/sub/pD
pIsub3/sub=4Isub2/sub/p
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