This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histo Pathology, Subject name: Pathology
Acridine orange is a fluorescent dye used to bind? 
Select and explain. 
A. DNA and RNA, B. Protein, C. Lipid, D. Carbohydrates
A: DNA and RNA
Answer: A: DNA and RNA 
Explanation: Ans. (a) DNA and RNARef: Harrison /150e-2* Acridine orange is a nucleic acid selective-fluorescent cationic dye useful for cell cycle determination.* It is cell-permeable, and interacts with DNA and RNA by intercalation or electrostatic attractions respectively and emits green and red right respectively.* Acridine orange can be used in conjunction with ethidium bromide to differentiate between live and apoptotic cells.