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DNA is susceptible to damage from many sources: chemical mutagens, UV or X-ray damage, even mismatches from the DNA replication process itself. Depending on the type and extent of the damage, cells will use many different repair processes to repair their genomes, and some of these repair mechanisms are more error prone than others.

For each of the following examples of DNA repair, choose if the process would be relatively error free or error prone.

Error Free

Error Prone

Repairing a double-strand break through non-homologous end joining

Repairing a mismatch through base excision repair

Repairing a double-strand break through homologous recombination

Using SOS system polymerases at replication forks stalled due to DNA damage

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