16.1958年梅塞尔林和斯塔尔作了如下实验将大肠杆菌放在含15nh4cl的培养基中繁殖几代其dna由于15n 的加入而比普通大肠杆菌的 Template




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tomski16.1958年梅塞尔林和斯塔尔作了如下实验将大肠杆菌放在含15nh4cl的培养基中繁殖几代其dna由于15n 的加入而比普通大肠杆菌的 coloring