In what year did Watson and Crick construct the first accepted DNA model?

In what year did Watson and Crick construct the first accepted DNA model?

• A. 1945
• B. 1958
• C. 1969
• D. 1953

Answer: (D)

When the DNA double-helix was first proposed and accepted. Watson and Crick published the model in 1953, presenting the idea that DNA is built as two anti-parallel strands wound into a helix, with base pairs inside forming the runged ladder and the sugar-phosphate backbone on the outside. This arrangement explains how genetic information could be stored and faithfully copied: base pairing (A with T, C with G) provides a simple, predictable mechanism for replication, and the double-helix geometry fits the X-ray diffraction data that suggested a regular, helical structure. 1953 is the best answer because it marks the landmark publication that introduced this specific, accepted model of DNA for the first time. The other years either precede the model or come after the initial proposal, so they don’t represent the moment Watson and Crick first presented the structure.

When the DNA double-helix was first proposed and accepted. Watson and Crick published the model in 1953, presenting the idea that DNA is built as two anti-parallel strands wound into a helix, with base pairs inside forming the runged ladder and the sugar-phosphate backbone on the outside. This arrangement explains how genetic information could be stored and faithfully copied: base pairing (A with T, C with G) provides a simple, predictable mechanism for replication, and the double-helix geometry fits the X-ray diffraction data that suggested a regular, helical structure.

1953 is the best answer because it marks the landmark publication that introduced this specific, accepted model of DNA for the first time. The other years either precede the model or come after the initial proposal, so they don’t represent the moment Watson and Crick first presented the structure.