Answer: Watson and Crick.
- A Meselson and Stahl
- B Watson and Crick
- C Jacob and Monod
- D Hershey and Chase
Correct answer: B. Watson and Crick
Explanation: James Watson and Francis Crick proposed the double helix structure of DNA in 1953, based on X-ray diffraction data from Rosalind Franklin.
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.