DNA Replication
Which of the following lacks 3'-5' exonuclease activity?

All of these
Taq DNA polymerase
T4 DNA ligase
Short fragment of DNA polymerase I

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DNA Replication
Proofreading activity to maintain the fidelity of DNA synthesis

occurs in prokaryotes but not eukaryotes
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 after the synthesis has been completed

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