6-30 The repair of mismatched base pairs or damaged nucleotides in a DNA strand requires amultistep process. Which choice below describes the known sequence of events in thisprocess?(a) DNA damage is recognized, the newly synthesized strand is identified by anexisting nick in the backbone, a segment of the new strand is removed by repairproteins, the gap is filled by DNA polymerase, and the strand is sealed by DNAligase.(b) DNA repair polymerase simultaneously removes bases ahead of it andpolymerizes the correct sequence behind it as it moves along the template. DNAligase seals the nicks in the repaired strand.(c) DNA damage is recognized, the newly synthesized strand is identified by anexisting nick in the backbone, a segment of the new strand is removed by anexonuclease, and the gap is repaired by DNA ligase.(d) A nick in the DNA is recognized, DNA repair proteins switch out the wrong baseand insert the correct base, and DNA ligase seals the nick.

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