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Which repair system operates to repair DNA strands that are actively transcribed?

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Which repair system operates to repair DNA strands that are actively transcribed?

(a) Double-strand breakage repair

(b) Nucleotide excision repair

(c) RNA repair

(d) Messenger RNA repair

I got this question by my college director while I was bunking the class.

My query is from DNA Repair topic in chapter DNA Replication and Repair, Cellular Reproduction of Cell Biology

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Correct answer is (b) Nucleotide excision repair

For explanation I would say: The template strands of genes that are actively being transcribed are repaired by the transcription coupled pathway of the nucleotide excision repair (NER) system.

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