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': 'Nucleic acids absorb UV light maximally at the wavelength of \nSelect and explain. \nA. 260nm, B. 280 nm, C. 410 nm, D. 320 nm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nucleic acids absorb UV light maximally at the wavelength of 260 nm 260/280 ratio of pure DNA/RNA is in the range of 1.8 to 2. Amino acids absorb U.V light (not visible light)- colorless. Aromatic amino acids absorb U.V light at 250-290 nm (maximum absorption is at 280nm) because of conjugated double bonds.', 'role': 'assistant'}]