DNA polymerase I has 5 ′ – 3 ′ polymerase activity, 5 ′ – 3 ′ exonuclease activity, and 3 ′ – 5 ′ exonuclease activity necessary for DNA replication. Mutations in the gene that encodes DNA polymerase I may cause the enzyme to lose these activities. Match the consequence of a loss‑of‑function mutation in DNA polymerase I to the corresponding lost activity.