热变性的DNA有以下哪些特征

A.碱基之间的磷酸二酯键断裂

B.双螺旋结构更加紧密

C.260nm处的吸光度下降

D.旋光性下降,黏度升高

E.旋光性和黏度均降低

相关专题: 旋光性  

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