Which enzyme catalyzes the separation of parent DNA strands during replication?

Which enzyme catalyzes the separation of parent DNA strands during replication?

• A. Ligase
• B. Primase
• C. Helicase
• D. Topoisomerase

Answer: (C)

The enzyme that catalyzes the separation of parent DNA strands during replication is helicase. During DNA replication, helicase unwinds the double helix structure of DNA by breaking the hydrogen bonds between the complementary base pairs. This separation creates two single-stranded templates that are essential for the synthesis of new DNA strands by DNA polymerase. Helicase is crucial for ensuring that replication proceeds effectively, allowing the replicative machinery to access the individual strands of DNA for copying. Without helicase, the DNA would remain tightly coiled and inaccessible, preventing proper replication from occurring. While ligase, primase, and topoisomerase play important roles in the overall process of DNA replication, they do not primarily serve the function of separating the DNA strands. Ligase connects Okazaki fragments on the lagging strand, primase synthesizes RNA primers necessary for DNA synthesis, and topoisomerase alleviates tension in the DNA helical structure ahead of the replication fork.

The enzyme that catalyzes the separation of parent DNA strands during replication is helicase. During DNA replication, helicase unwinds the double helix structure of DNA by breaking the hydrogen bonds between the complementary base pairs. This separation creates two single-stranded templates that are essential for the synthesis of new DNA strands by DNA polymerase.

Helicase is crucial for ensuring that replication proceeds effectively, allowing the replicative machinery to access the individual strands of DNA for copying. Without helicase, the DNA would remain tightly coiled and inaccessible, preventing proper replication from occurring.

While ligase, primase, and topoisomerase play important roles in the overall process of DNA replication, they do not primarily serve the function of separating the DNA strands. Ligase connects Okazaki fragments on the lagging strand, primase synthesizes RNA primers necessary for DNA synthesis, and topoisomerase alleviates tension in the DNA helical structure ahead of the replication fork.