r型肺炎双球菌存在控制荚膜不能形成的基因s型肺炎双球菌存在控制荚膜合成的基因将加热杀死的s型菌与r型活菌混合后注入小鼠体内�生了r型菌 Template




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tomskir型肺炎双球菌存在控制荚膜不能形成的基因s型肺炎双球菌存在控制荚膜合成的基因将加热杀死的s型菌与r型活菌混合后注入小鼠体内�生了r型菌 coloring