DNA polymerase I (choose the most complete answer). has both $3'$ - $5'$ and $5'$ - $3'$ exonuclease activity. proofreads and has both $3'$ - $5'$ and $5'$- $3'$ exonuclease activity. proofreads and has $5'$ - $3'$ exonuclease activity. has $5'$ - $3'$ exonuclease activity. proofreads and has $3'$ - $5'$ exonuclease activity.
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