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

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

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DNA Structure and Replication
The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?

The many different amino acid R groups on proteins confer many different shapes.
All of these
Some S amino acids cause proteins to bend; others cause protein to flatten.
DNA has one main function in cells whereas proteins have many.

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