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DNA160-page6 - • DNA was double strand(because of the 2...

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DNA: Structure and Replication - 6 4. X-ray diffraction (best done by Rosalind Franklin at King's College in London) showed that DNA: was long and thin had a uniform diameter of 2 nanometers had a highly repetitive structure with .34 nm between nitrogen bases in the stack was probably helical in shape, like a circular stairway Watson and Crick From this information, James Watson and Francis Crick (who died in July, 2004 at the age of 88) determined the structure of DNA in 1953 and published their work in Nature . They surmised (and confirmed):
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Unformatted text preview: • DNA was double strand (because of the 2 nm diameter) with a helical ladder-like structure. • To maintain the uniform diameter, a double-ring base probably would pair with a single-ring base along the length of the molecule Adenine can hydrogen bond to thymine at 2 places. Guanine can hydrogen bond to cytosine at 3 places • This explained Chargaff's findings that the amounts of adenine and thymine were the same, and the amounts of guanine and cytosine were the same for a species....
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