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Rec BCD can chew 3’ end of the DSB till it reaches _____________ sequence.

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Rec BCD can chew 3’ end of the DSB till it reaches _____________ sequence.

(a) TATA

(b) Chi

(c) Phi

(d) Eta

I have been asked this question in examination.

I would like to ask this question from Repair of DNA Damage: Recombinational and Bypass in portion DNA Mutation, DNA Repair, Transposable Elements of Cytogenetics

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Right option is (b) Chi

Explanation: Initially the exonuclease Rec BCD can chew up both the 3’ and 5’ end of the DSB till it reaches the specific chi sequence in the 3’ strand. Then it stops chewing the 3’ end and increases its activity in the 5’ end.

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