Question

Which one of the following is the peak absorption range of ultraviolet light by heterocyclic bases (nitrogen bases)?

• A. 1500 nm
• B. 26 nm
• C. 75 nm
• D. 260 nm

Answer 1

Answer: (D)

260 nm

Heterocyclic bases (Nitrogenous bases) of DNA or RNA absorb maximum at 260 nm in UV spectrum. The maximum absorption at 260 nm by nucleic acids is due to the heterocyclic rings of nitrogenous bases.

So, the correct answer is '260 nm'.