2.用15n标记大肠杆菌的dna然后放到14n 的培养基中培养连续培养三代在最后一代大肠杆菌中含15n的链占该代dna分子的总链数的 Template




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tomski2.用15n标记大肠杆菌的dna然后放到14n 的培养基中培养连续培养三代在最后一代大肠杆菌中含15n的链占该代dna分子的总链数的 coloring