Question

5'-end capture occurs only in the ______ model?

A) Synthesis-Dependent Strand Annealing Model
B) Holliday Junction Model
C) Double-Strand Break Repair Model
D) None of the above

Answer 1

The process of 5'-end capture occurs in the Synthesis-Dependent Strand Annealing Model. In DNA synthesis elongation, attaching complementary nucleotides to the template strand is involved, facilitated by DNA polymerase.

Step-by-step explanation:

5'-end capture, a mechanism related to the processing of DNA ends during homologous recombination, occurs specifically in the Synthesis-Dependent Strand Annealing (SDSA) model. The SDSA model is one way by which cells can repair double-strand breaks in DNA. In the elongation step of DNA synthesis, the correct answer to which part is involved would be b. attaching complementary nucleotides to the template strand. This process is facilitated by the enzyme DNA polymerase, which reads the template strand and adds nucleotides in the 5' to 3' direction. Regarding DNA replication, the leading strand is synthesized continuously toward the replication fork, while the lagging strand is synthesized as Okazaki fragments in a direction away from the replication fork.