赫尔希和蔡斯分别用35S和32P标记T2噬菌体的不同有机物。下列被标记

赫尔希和蔡斯分别用35S32P标记T2噬菌体的不同有机物。下列被标记的部位组合正确的是(    )

A.①②        B.①③     C.①④       D.②④

答案

A

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