Answer: Helicase.
- A DNA polymerase
- B Helicase
- C Ligase
- D Primase
Correct answer: B. Helicase
Explanation: Helicase unwinds the parental DNA double helix at the replication fork, separating the two strands for replication.
Helicase unwinds the double helix at the replication fork; one new strand (leading) is synthesised continuously toward the fork, while the other (lagging) must be made in short, separate Okazaki fragments because DNA polymerase only adds nucleotides 5'→3'.
Concept context
DNA structure, replication, transcription, translation, the genetic code, and gene regulation (lac operon). The single most important chapter for NEET molecular biology.