Final answer:
Mismatch repair corrects errors in DNA replication by removing incorrectly added nucleotides and replacing them with the correct bases. It occurs after replication is completed to prevent permanent damage.
Step-by-step explanation:
Mismatch repair is a mechanism that corrects errors in DNA replication. It recognizes incorrectly added nucleotides and removes them, replacing them with the correct bases. This repair process occurs after replication is completed and ensures that mutations are repaired before they become permanent damage. Mismatch repair is important for maintaining the accuracy and integrity of DNA.