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.
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.

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DNA Structure and Replication
Nucleosome is

an octamer of four histones without H1 protein
an hexamer of three histones without H1 protein
an octamer of four histones with H1 protein
an hexamer of three histones with H1 protein

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

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

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