Which of the Following Mechanisms is Involved in Double-Strand DNA

Question

Which of the following mechanisms is involved in double-strand DNA repair?
A)Homology-dependent repair
B)Nonhomologous end joining
C)Mismatch repair
D)A and B
E)A,B,and C

Accepted Answer

Double-strand DNA repair can occur through either homology-dependent repair (HDR) or nonhomologous end joining (NHEJ). HDR requires a template for repair and uses homologous DNA sequences to repair the damaged DNA strand. NHEJ, on the other hand, simply rejoins the broken ends of the DNA without reliance on homology. Therefore, both A and B are mechanisms involved in double-strand DNA repair. Mismatch repair (C) is not related to double-strand DNA repair and is involved in correcting mistakes made during DNA replication.