DNA Structure and Replication
In DNA, nucleotides are covalently joined together by

2', 3' phosphodiester bonds to form a repetitive sugar-phosphate chain
3', 4' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain
3', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain

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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?

All of these
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.
DNA has one main function in cells whereas proteins have many.

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DNA Structure and Replication
Nucleosome is

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

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