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【单选题】
关于蛋白质的四级结构描述正确的是 ( )A.
所有蛋白质都有四级结构
B.
蛋白质变性时四级结构不一定受到破坏
C.
亚基间通过非共价键聚合
D.
四级结构是蛋白质保持生物活性的必要条件
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