At the physiological pH the DNA molecules are
Positively charged
Negatively charged
Neutral
Amphipathic
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)"
Structure of DNA