wunder beta📘 The Watson and Crick DNA Paper Explained
To understand the method, central claim, evidence, and the debate that followed.
What you’ll learn
- The paper opens as a suggestionRead the 1953 paper as a constrained proposal, not as a photograph of DNA.Watson and Crick open by suggesting a structure, reject Pauling's triple helix, and set a model that must fit chemistry and heredity.
- What the X-rays could sayExplain what fibre diffraction could settle and how the Nature issue placed three papers together.An X-cross narrows geometry. Photograph 51 was a May 1952 B-form image. The paper itself said published X-ray data were not a rigorous test.
- The model that fitConnect opposite-running chains and specific base pairing to a possible copying rule.Two antiparallel chains, phosphates out, and A-T / G-C pairing keep the width even and make one strand a template for the other.
- Credit and what to noticeSeparate the model's scientific fit from later questions of access, acknowledgement, and the 1962 prize.The paper thanks King's workers briefly. Later accounts of Photograph 51, Franklin's 1958 death, and the Nobel naming are a second story.
Questions this course answers
What kind of problem did Watson and Crick's paper address?
The paper proposed a structure that had to fit chemistry, fibre geometry, and the possibility of carrying information.
Put the three DNA papers in the 25 April 1953 Nature issue in the order they were printed.
The issue printed Watson and Crick on pages 737–738, Wilkins and colleagues on 738–740, then Franklin and Gosling on 740–741.
In the 1953 paper, how many residues sit on each chain in one full turn of the helix?
They assumed 36 degrees between adjacent residues, so the structure repeats after 10 residues, or 34 angstroms.
Match each feature of the 1953 model to what it does.
The model coordinated an outer backbone, opposite-running chains, and interior pairs that keep the width even.
Why should a reading of the 1953 paper include Franklin, Gosling, and Wilkins?
The model's persuasive force and the distribution of recognition are related but distinct questions.
What word do we now use for strands that run in opposite directions?
The 1953 paper says the sequences of atoms in the two chains run in opposite directions. The modern name is antiparallel.
Grounded in trusted sources
- J. D. Watson and F. H. C. Crick, Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid, Nature 171 (25 April 1953), 737–738: https://doi.org/10.1038/171737a0
- Full text of the 1953 Watson and Crick paper, reprinted with permission from Nature, Exploratorium / Cold Spring Harbor annotated edition: https://annex.exploratorium.edu/origins/coldspring/printit.html
- R. E. Franklin and R. G. Gosling, Molecular Configuration in Sodium Thymonucleate, Nature 171 (1953), 740–741: https://doi.org/10.1038/171740a0
- M. H. F. Wilkins, A. R. Stokes, and H. R. Wilson, Molecular Structure of Deoxypentose Nucleic Acids, Nature 171 (1953), 738–740: https://doi.org/10.1038/171738a0
- Wellcome Collection, A Structure for DNA, Francis Crick papers PP/CRI/H/1/11, six draft texts of the first Watson and Crick paper: https://wellcomecollection.org/works/kacawn9j
- Nobel Prize, The Nobel Prize in Physiology or Medicine 1962, official citation for Crick, Watson, and Wilkins: https://www.nobelprize.org/prizes/medicine/1962/summary/
- Brian Sutton, The story behind Photograph 51, King's College London, 14 April 2023, on the 2–6 May 1952 exposure, the X-cross, and the January 1953 showing: https://www.kcl.ac.uk/the-story-behind-photograph-51
- Victoria Hernandez, Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid (1953), Embryo Project Encyclopedia, 31 October 2019: https://embryo.asu.edu/pages/molecular-structure-nucleic-acids-structure-deoxyribose-nucleic-acid-1953-james-watson-and
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