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“DNA的粗提取与鉴定”是现行高中生物学课程的一项引导式学生探究,是必做的学生分组实验。该实验的原理是:DNA在氯化钠中的溶解度随着氯化钠浓度的改变而改变,在氯化钠浓度为0.14mol/L时,DNA的溶解度最低。利用这一原理可使溶解在氯化钠溶液中的DNA析出,再根据DNA不溶于酒精,而蛋白质等细胞中的某些物质溶
“The rough extraction and identification of DNA” is an introductory student inquiry into the current high school biology curriculum. It is a necessary student grouping experiment. The principle of this experiment is that the solubility of DNA in sodium chloride varies with the concentration of sodium chloride, and the solubility of DNA is lowest when the concentration of sodium chloride is 0.14 mol/L. By using this principle, DNA dissolved in sodium chloride solution can be precipitated, and then insolubilized according to DNA, while certain substances in cells such as proteins are dissolved.