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The fidelity of replication is very high, with an overall error rate of 10-9 to 10-10. Insertion of an inappropriate nucleotide that occurs during replication can be corrected by editing during the replication process. This proof reading function is performed by a 3′-5′ exonuclease activity associated with the polymerase complex. The post replication repair process also increases the fidelity of replication.
Which “one” of the following is not a post replication DNA repair mechanism?
A. 5′-3′- Exonuclease repair
B. Base excision repair 
C. Mismatch repair
D. Nucleotide excision repair
E. Direct repair

Check the answer at

http://usmle.biochemistryformedics.com/dna-repair/

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