摘要：要点一,DNA分子的结构 1．DNA的结构单位：脱氧核苷酸（4种） 2．DNA的空间结构：规则的双螺旋结构 （1）DNAX双链反向平行：一条走向是5’→3’，另一条走向是3’→5’，有规则地盘绕成双螺旋结构。
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