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Genetics and Genomics

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Moderate

DNA Repair Mechanisms

GENES-C7YOFG

Following UV light exposure, pyrimidine dimers form in cellular DNA. This results in a bulky defect in one of the two strands of a double helix. Therefore, the other strand can be used as a template to guide the correction of the damaged strand.

Repair of pyrimidine dimers is performed using

A

base excision repair.

B

mismatch repair.

C

nucleotide excision repair.

D

methylation of cytosine and adenosine bases.