This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Basics of DNA, Subject name: Biochemistry
[{'content': 'At physiologic pH, DNA is \nSelect and explain. \nA. Positively charged, B. Negatively charged, C. Amphoteric, D. Uncharged', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nucleic acid carries negative charge at physiological pH Negative charge at physiologic pH is due to presence of phosphodiester linkages This propey is useful for the separation of DNA or RNA by electrophoresis. DNA will move towards the anode. Shoer DNA molecules will move faster than longer molecules in agarose gel electrophoresis.', 'role': 'assistant'}]