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State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · Question 20

The double-helix structure of DNA was discovered by:

  1. James Watson and Francis Crick
  2. Rosalind Franklin and Maurice Wilkins
  3. Linus Pauling
  4. Gregor Mendel
Show answer & explanation

Answer: (A) James Watson and Francis Crick

Explanation

Watson and Crick published the DNA double-helix model in Nature in 1953, using Franklin's X-ray images.

  • (A) Correct

    Correct: they proposed the double-helix model in 1953.

  • (B) Incorrect

    Wrong: their X-ray data were key, but the model was Watson and Crick's.

  • (C) Incorrect

    Wrong: he proposed an incorrect triple helix.

  • (D) Incorrect

    Wrong: father of genetics; did not study DNA.