Question

DNA repairing is done by

• A. ligase
• B. DNA polymerase I
• C. DNA polymerase III
• D. both (a) and (b)

Answer 1

The correct option is D both (a) and (b)

DNA polymerase I is an enzyme that participates in the process of prokaryotic DNA replication.
DNA Polymerase Ienzyme is a repair polymerase which is involved in excision repair with both 3'-5' and 5'-3' exonuclease activity and processing of Okazaki fragments generated during lagging strand synthesis. Single-strand breaks are repaired by DNA ligase using the complementary strand of the double helix as a template, with DNA ligase creating the final phosphodiester bond to fully repair the DNA. DNA ligase is used in both DNA repair and DNA replication.