Effect of ultraviolet radiation on DNA is formation of: (A) Purine dimers, (B) Pyrimidine dimers, (C) DNA-DNA cros linking, (D) All of the above
Answer is B. UV light causes the formation of thymine dimers, where covalent bonds are formed between adjacent thymine residuesSince repair mechanism is not operating these mutations are accumulated, leading to cancerRef: DM Vasudevan, 7th edition, page no: 584