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

Correct Answer: Two adjacent pyrimidine residues to form covalently bonded dimer

Description: Ans. B. Two adjacent pyrimidine residues to form covalently bonded dimerDamage to DNA during its replication can occur from ultra violet irradiations that causes thymine dimer formation.

Category: Biochemistry

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