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DNA is a polar molecule because it has a negatively (-) charged phosphate group attached to the 5' end of the molecule and a negatively charge hydroxl group (OH) attached to t â¦ he 3' prime end of the molecule. Thus, it is a POLAR molecule which allows it to interact in an aqueous environment.NA is a polar molecule because it has a negatively (-) charged phosphate group attached to the 5' end of the molecule and a negatively charge hydroxl group (OH) attached to t â¦ he 3' prime end of the molecule.
RNA and DNA are polymers of nucleotides. The backbone of the polymer is a repeating chain of sugar-phosphate-sugar-phosphate-etc. These polymers have polarity, meaning having a directionality. The phosphate of the 5'-end of one nucleotide is linked to the 3'-position of the next nucleotide. In the model of DNA (left), the left strand has a polarity of 5' (top) to 3' (bottom), and the other DNA strand has the opposite polarity. The two DNA strands are said to be antiparallel.