... DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. (Watson, 1968) The bases are adenine (A), thymine (T), cytosine (C) and guanine (G). (Watson, 1968)"The stuff genes are made of."()In the early 1950's, British biophysicist Francis ... pyrimidine.(Watson, 1968) Later, they discovered that there was a problem with their data. They could not determine the band sequence between the...

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