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【单选题】
关于生物素标记蛋白质的注意事项，下列说法错误的是A.
根据抗原或抗体分子结构中所带可标记基团的种类以及分子的理化性质，选择相应的活化生物反应条件
B.
活化生物素与待标记抗原或抗体可以为任意比例
C.
在生物素与被标记物之间加入交联臂样结构可减少空间位阻影响
D.
生物素与抗原、抗体等蛋白质结合后，不影响后者的免疫活性
E.
生物素标记酶时会影响其免疫活性
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举一反三
【单选题】The senator, who was against the war, claimed that with all the ____ and complex economic and political factors, the outcome of the war was still uncertain.
A.
fringe
B.
ventilate
C.
unify
D.
indefinite
【简答题】The senator, who was against the war, claimed that with all the and complex economic and political factors, the outcome of the war was still uncertain.
【简答题】在测定样品前,必须先用 来调节旋光仪的零点。
【简答题】 The senator, who was against the war, claimed that with all the and complex economic and political factors, the outcome of the war was still uncertain.
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