The DNA Damage Caused by Ultraviolet Radiation Is

Question

The DNA damage caused by ultraviolet radiation is
A)never repaired.
B)repaired during transcription.
C)repaired during translation.
D)cut out and replaced.
E)repaired by DNA replication.

Accepted Answer

DNA damage caused by ultraviolet radiation triggers the mechanism called nucleotide excision repair (NER). In this process, the damage is recognized and cut out by specific enzymes, and the resulting gap is filled in with a DNA polymerase and ligase to restore the original sequence. This process occurs before transcription or replication to minimize the chance of introducing mutations in the DNA sequence.