دوست عزیز شما 110 درصد دارین اشتباه میکنین....6 سال پیش این سوال در سایت answers.yahoo.comمطرح شد....و طبق متنی که میخونین دی ان ای در اتانول حل نمیشه و به همین دلیل هم هست که ساختارش در اتانول حفظ میشه.....اگه میخواین سرچش کنین و دلیل اینو بدونین میتونین سوال why is dna insoluble in ethanol and soluble in waterرو مطرح کنین تا دقیقا همون صفحه بیاد....!بخشی از متنو واستون آوردم که وقتتون تلف نشه....Best Answer - Chosen by VotersBOTH ethanol and water are polar. The idea that water is more negative is wrong; it's not an ion, it has a zero net charge. Ethanol is LESS polar than water. It is less polar enough that DNA is relatively insoluble in it. "Like dissolves like." Remember that polar and non-polar, and solubility are all relative terms, and solubility is defined quantitatively along a scale, not discretely or qualitatively; even water and oil mix to some extent.Source(s):
http://en.wikipedia.org/wiki/Ethanol_pre…