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The function of the eukaryotic DNA replication factor PCNA (proliferating cell nuclear antigen) is similar to that of the β-subunit of bacterial DNA polymerase III in that it:A) facilitates replication of telomeres.B) forms a circular sliding clamp to increase the processivity of replication.C) has a 3' → 5' proofreading activity.D) increases the speed but not the processivity of the replication complex.E) participates in DNA repair.

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