Why is the DNA twisted?
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X-ray crystallography provided the final clue that the DNA molecule is a double helix, shaped like a twisted ladder. ... They showed that alternating deoxyribose and phosphate molecules form the twisted uprights of the DNA ladder.
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The other strand can be formed in a similar way structuring a Double Helix. The actual shape of DNA is determined by the allowed bond angles in the sugar-phosphate backbone, the way the hydrophobic bases stack together and the interaction between the two strands.
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