DNA Replication
Which of the following possesses both 5'-3' and 3'-5' exonuclease activity?

Kornberg enzyme
Taq DNA polymerase
DNA polymerase III
None of these

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

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