Race For The Double Helix Quotes

Wielding imaging techniques such as X-ray crystallography, which is what Rosalind Franklin used to find evidence of the structure of DNA, structural biologists try to discover the three-dimensional shape of molecules. Linus Pauling worked out the spiral structure of proteins in the early 1950s, which was followed by Watson and Crick’s paper on the double-helix structure of DNA.

By then Watson and Crick had a pretty good idea of DNA’s structure. It had two sugar-phosphate strands that twisted and spiraled to form a double-stranded helix. Protruding from these were the four bases in DNA: adenine, thymine, guanine, and cytosine, now commonly known by the letters A, T, G, and C. They came to agree with Franklin that the backbones were on the outside and the bases pointed inward, like a twisted ladder or spiral staircase. As Watson later admitted in a feeble attempt at graciousness, “Her past uncompromising statements on this matter thus reflected first-rate science