Biochemistry Ultraviolet light can damage a DNA strand causing: A Two adjacent purine residue to form a covalently bounded dimer B Two adjacent pyrimidine residues to form covalently bonded dimer C Disruption of phosphodiesterase linkage D Disruption of non-covalent linkage 💡 Explanation Ultraviolet light can damage a DNA strand causing: ✓ Correct Answer: B. Two adjacent pyrimidine residues to form covalently bonded dimer