�学家用放射性同位素分别标记胸腺嘧啶和尿嘧啶培养蚕豆观察其根尖分生区细胞的有丝分裂.已知蚕豆细胞�期是20小时根据碱基被利用的情况绘图如下 Template




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tomski�学家用放射性同位素分别标记胸腺嘧啶和尿嘧啶培养蚕豆观察其根尖分生区细胞的有丝分裂.已知蚕豆细胞�期是20小时根据碱基被利用的情况绘图如下 coloring