DNA Structure and Replication
The B-DNA structure found in solution is a

right-handed double helix of antiparallel chains (∼10 bp/turn)
left-handed double helix of antiparallel chains (10 bp/turn)
right-handed double helix of parallel chains (∼10 bp/turn)
left-handed zig-zag helix of antiparallel chains (10 bp/turn)

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