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Why dna molecule is spiral in shape and not straight like a ladder?

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Why dna molecule is spiral in shape and not straight like a ladder?

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  1. Due in part to hydrophobic interactions between the neighboring stacks of base-pairs.

    Even in the single-stranded state, the bases prefer to be stacked (like the steps of a spiral staircase if the bases are identical) and a single-stranded chain can also have regions of helical conformation.http://tigger.uic.edu/classes/phys/phys4...

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