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Unformatted text preview: the double helix shape James Watson and Francis Crick see the photo and use Chargaff's Rule to assemble a DNA model Two outside strands of alternating deoxyribose and phosphate Cytosine pairs with Guanine through a triple bond Adenine pairs with Thymine through a double bond Published 1page letter in "Nature" in 1953. DNA Structure A = T & G = C Therefore A + G = C + T If we know that there a person's DNA is 32% Thymine can we figure out the rest? DNA Orientation The Carbons on the deoxyribose sugar are numbered The two strands of DNA run opposite each other One strand goes 5' to 3' while the other goes 3' to 5' This orientation is called "antiparallel"...
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