某�学家用放射性同位素分别标记的胸腺嘧啶培养蚕豆观察其根尖分生区细胞的有丝分裂.已知蚕豆细胞一个有丝分裂�期是20h根据这两种碱基被细胞 Template




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tomski某�学家用放射性同位素分别标记的胸腺嘧啶培养蚕豆观察其根尖分生区细胞的有丝分裂.已知蚕豆细胞一个有丝分裂�期是20h根据这两种碱基被细胞 coloring