高中生物多媒体教学课件. DNA 的化学结构. DNA 的化学结构（1）. 基本单位－脱氧核苷酸. 磷酸. 脱氧 核糖. 碱基. A. G. C. T. DNA 的化学结构（2）. A. G. C. T. 脱氧核苷酸的种类. 腺嘌呤脱氧核苷酸. 鸟嘌呤脱氧核苷酸. 胸腺嘧啶脱氧核苷酸. 胞嘧啶脱氧核苷酸. C. A. A. T. G. C. T. G. DNA 的化学结构（3）. 连 接.
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