What kind of DNA damage is repaired using the mismatch repair mechanism?

• A. Point mutations made during DNA replication.
• B. Point mutations caused by chemical mutagens.
• C. Point mutations caused by irradiation.
• D. Double-strand breaks in DNA made during replication.

Answer: (A)

Verified step by step guidance

1. Understand the types of DNA damage: DNA can be damaged in various ways, including point mutations, double-strand breaks, and more. Point mutations are changes in a single nucleotide base pair.
2. Learn about mismatch repair: Mismatch repair is a cellular process that corrects errors introduced during DNA replication, specifically targeting mismatches in base pairs.
3. Identify the types of point mutations: Point mutations can occur due to errors during DNA replication, exposure to chemical mutagens, or irradiation.
4. Distinguish between mismatch repair and other repair mechanisms: Mismatch repair specifically addresses errors made during DNA replication, while other mechanisms, like homologous recombination, repair double-strand breaks.
5. Apply knowledge to the problem: Recognize that mismatch repair is primarily involved in correcting point mutations that occur during DNA replication, rather than those caused by external factors like chemical mutagens or irradiation.