27.某�学家用放谢性同位素分别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20小时根据这两种碱基 Template


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tomski27.某�学家用放谢性同位素分别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20小时根据这两种碱基 coloring