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Gaokao Biology Practice Question

关于 “DNA 的粗提取与鉴定” 实验, 下列说法错误的是

  1. A.过滤液沉淀过程在 $4^{\circ} \mathrm{C}$ 冰箱中进行是为了防止 DNA 降解
  2. B.离心研磨液是为了加速 DNA的沉淀
  3. C.在一定温度下, DNA 遇二苯胺试剂呈现蓝色
  4. D.粗提取的 DNA 中可能含有蛋白质

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