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The two strands of a DNA double helix are
Aparallel and right-handed
Bparallel and left-handed
Canti-parallel and right-handed
Danti-parallel and left-handed
Answer & Solution
Correct answer: C. anti-parallel and right-handed
Watson-Crick showed that the two strands run anti-parallel (one 5′→3′, the other 3′→5′) and coil in a right-handed spiral. Pitch ≈ 3.4 nm, ~10 bp per turn.
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