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【单选题】
以醋酸纤维素薄膜为支持物进行血清蛋白电泳,使用pH为8.6的巴比妥缓冲液,各种蛋白质的电荷状态是A.
白蛋白和球蛋白都带有负电荷
B.
白蛋白和球蛋白都带有正电荷
C.
白蛋白带正电荷,球蛋白带负电荷
D.
白蛋白带负电荷,球蛋白带正电荷
E.
除γ–球蛋白都带负电荷
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