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疯牛病的发病基础是——蛋白质的（）结构缺陷。
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疯牛病的发病基础是——蛋白质的（）结构缺陷。
A.一级
B.二级
C.三级
D.四级
E.a螺旋或b片层结构
F.氨基酸排列顺序
正确答案：二级；a螺旋或b片层结构
Tag：
医学细胞生物学
结构
螺旋
时间：2022-03-02 21:23:55
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