Biology / Bio 1209 · Atom · ~20 seconds
The Double Helix's Overall Structure
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DNA's double helix is a uniform, right-handed twist of two antiparallel, base-paired strands, roughly two nanometers wide along its length.
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One full turn of the helix spans about ten base pairs, regardless of which bases make up that turn.
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The helix's width and turn spacing stay constant everywhere — only the base sequence varies from one stretch of DNA to another.