The second two activities of DNA Pol I are important for replication, but DNA Polymerase III (Pol III) is the enzyme that performs the 5'-3' polymerase function. 1  Primase-The requirement for a free 3' hydroxyl group is fulfilled by the RNA primers that are synthesized at the initiation sites by these enzymes. These are removed by the 5' to 3' exonuclease action of Polymerase I. 2  5. 3  The final product does not have any gaps in the DNA that result from the removal of the RNA primer. 4  These are filled in by the action of DNA Polymerase I.
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