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?

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

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

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

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