Question

How does base excision repair work?

A) Removes a whole segment of DNA
B) Replaces a mismatched nucleotide
C) Corrects single-strand breaks
D) Replicates the entire DNA strand

Answer 1

Base excision repair is a process where enzymes remove damaged or abnormal bases from the DNA strand and replace them with the correct ones. It is used to correct specific types of damage, such as thymine dimers caused by UV exposure.

Step-by-step explanation:

In base excision repair, enzymes remove damaged or abnormal bases from the DNA strand and replace them with the correct ones. This repair mechanism is often used to correct specific types of damage, such as thymine dimers caused by exposure to UV light. The process involves making a cut on both ends of the damaged base, removing the segment of DNA containing the damage, and replacing it with the correctly paired nucleotides.