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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.
DNA has a negative charge and according to physics, two species having opposite charge attract to each other so I think that's why DNA runs to positive chargeâ¦ The negative charge is imparted on the DNA by the presence of phosphate molecule so during ELECTROPHORESIS process it runs towards the opposite end that is positive.. Keep smiling â¥ï¸@