Question

Which dna repair mechanism is used to repair thymine and guanine basepairing?

Answer 1

During DNA replication, uracil will pair with adenine rather than guanine (as it would if the base was still cytosine), so an uncorrected cytosine-to-uracil change can lead to a mutation 5. To prevent such mutations, a glycosylase from the base excision repair pathway detects and removes deaminated cytosines.