<prompt> At the physiological pH the DNA molecules arePositively chargedNegatively chargedNeutralAmphipathic  <response>: Ans. is b i.e. Negatively charged DNA molecules are negatively charged, this is evident as it is stained by a cationic positively charged dye.Read the following lines for Ronald Hoffman Hematology:Anionic cellular elements nuclear DNA reacts with cationic dye Methylene blue 