大肠杆菌的质粒上含有lacz基因其编码的产物β半乳糖苷酶在xgal和iptg存在时可以产生蓝色沉淀使菌落�现蓝色否则菌落�现白色该 Template




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tomski大肠杆菌的质粒上含有lacz基因其编码的产物β半乳糖苷酶在xgal和iptg存在时可以产生蓝色沉淀使菌落�现蓝色否则菌落�现白色该 coloring