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限制酶作用于①部位，DNA连接酶作用于③部位 该DNA的特异性表现在碱基种类和(A＋T)/(G＋ )的比例上 C.若该DNA中A.为p个，占全部碱基的n/m(m>2n)，则G.的个数为(pm/2n)－p 把该DNA放在含15N.的培养液中复制两代，子代中含15N.的DNA占3/4
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