The double helical structure of DNA, 3D animation with no audio
Based on available data from X-ray diffraction patterns and 3D conceptualization through model building, Watson and Crick proposed that DNA is a double helix "a twisted ladder" with two phosphate-based backbones and "runged" nucleotides that pair. (DNAi Location: Code > Finding the Structure > Putting it together > Base pairing interactive)
Animation of 2D DNA model becoming three dimensional.
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- ID: 15493
- Source: DNALC.DNAi
Image depicting DNA helix model and table.
James Watson and Francis Crick explain how they solved the structure of DNA. Erwin Chargaff explain how he measured the levels of each of the four nitrogenous bases.
Although the chemistry was wrong, Linus Pauling's triple-stranded DNA model was a catalyst for James Watson and Francis Crick to solve the structure of DNA.
DNA base pairs
How an X-ray diffraction pattern is created and how the DNA X-ray diffraction pattern can be interpreted to give the dimensions.
15492. Discovering the double helix structure of DNA, James Watson, video with 3D animation and narration
James Watson used cardboard cutouts representing the shapes of the DNA bases to figure out how bases pair.
Explore DNA's structure.
Deoxyribose and phosphate molecules form the uprights and nucleotide pair form the rungs of the DNA ladder.
James Watson talks about his partnership with Francis Crick.