which of the dna activities play a role in repairing dna defects

1 answer

The DNA activities that play a role in repairing DNA defects are

1. Mismatch repair System: This system corrects errors that occurred during DNA replication, for example, when the wrong base is added to a new strand.

2. Nucleotide Excision Repair: This system corrects damage that results from UV radiation and other chemical damage, such as chemicals in cigarette smoke that can cause mutations.

3. Base Excision Repair: This system corrects damage caused by free radicals—chemically unstable molecules that can damage DNA and other molecules in the body.

4. Homologous Recombination: This system repairs double-strand breaks in DNA that occur during replication or in response to DNA damage.

5. Non-homologous end joining (NHEJ): This system repairs double-strand breaks in DNA by rejoining the broken ends.