Respuesta :
The structure of DNA double helices are hydrophilic due to their highly charged phosphate groups and hence are soluble in water.
DNA is highly polar because of its highly charged phosphate backbone. Water is also polar and thus dissolves DNA following the principle " like dissolves like ''. The DNA is composed of N-bases, phosphate backbone, and pentose sugar. N-bases are hydrophobic but are on the inner side of the structure. Whereas, phosphates are hydrophilic and are on the outer side of the structure. The presence of phosphates outside the DNA structure makes it water-soluble.
In addition to this, H in water is positively charged and phosphates in DNA are negatively charged. This enables DNA to get dissolved in water. On the other hand, alcohol, being polar, reduces the affinity of hydrogen bonds with DNA, thus making it insoluble in alcohol.
To know more about DNA structure, refer to the following link:
https://brainly.in/question/9762844
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