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.
Some S amino acids cause proteins to bend; others cause protein to flatten.
All of these
DNA has one main function in cells whereas proteins have many.

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DNA Structure and Replication
Nucleosome is

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

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