Within a double-stranded DNA molecule, an A on one strand is paired with a G on the other strand. The DNA repair mechanism most likely to correct this error is a mismatch.
Mismatch base repair is DNA repair caused by base pairing errors during replication. When the cell will divide, the DNA in it will undergo replication or duplicate so that the two daughter cells have the same DNA. In this replication, base pairing errors sometimes occur so that the results do not match the template of the parent DNA. With the help of the polymerase enzyme, this gap will be filled by a new segment carrying the repaired base, which is then attached with the help of the ligase enzyme.
Adenine always pairs with thymine (A-T), while cytosine always pairs with guanine (G-C).
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