What is the correct order for the following events in excision repair of DNA? (1) DNA polymerase I adds correct nucleotides by 5?-to-3? replication; (2) damaged nucleotides are recognized; (3) DNA ligase seals the new strand to existing DNA; (4) part of a single strand is excised.
a. 1, 2, 3, 4
b. 2, 1, 3, 4
c. 2, 4, 1, 3
d. 3, 4, 2, 1
e. 4, 2, 3, 1
Answer: c. 2, 4, 1, 3
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