题目内容

关于G蛋白偶联受体的叙述错误的是

A. 结构上为单体蛋白
B. 其肽链反复七次跨膜
C. 此类受体总是通过G蛋白向下游传递信号
D. 有的受体自身具有蛋白激酶活性
E. 配体与受体结合后,通常导致受体构象改变而激活

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