Final answer:
Mismatch repair is a mechanism by which our DNA polymerase can fix a mismatch. Mismatch repair enzymes recognize the incorrectly added nucleotide and excise it from the DNA, then fill the gap with the correct base using DNA polymerase.
Step-by-step explanation:
Mismatch repair is a mechanism by which our DNA polymerase can fix a mismatch. Mismatch repair enzymes recognize the incorrectly added nucleotide and excise it from the DNA. The gap is then filled with the correct base by the action of DNA polymerase. This mechanism helps to prevent permanent damage and mutations in the DNA.