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【单选题】
具有四级结构的蛋白质特征是
A.
分子中必定含有辅基
B.
在两条或两条以上具有三级结构多肽链的基础上，肽链进一步折叠盘曲形成
C.
每条多肽链都具有独立的生物学活性
D.
依赖肽键维系四级结构的稳定性
E.
有活性的蛋白质均具有四级结构
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