DNA Replication
Which of the following repairs nicked DNA by forming a phosphodiester bond between adjacent nucleotides?

Topoisomerases
Helicase
DNA ligase
DNA gyrase

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DNA Replication
Proofreading activity to maintain the fidelity of DNA synthesis

requires the presence of an enzyme separate from the DNA polymerases
occurs after the synthesis has been completed
occurs in prokaryotes but not eukaryotes
is a function of the 3'-5' exonuclease activity of the DNA polymerases

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