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?

Some S amino acids cause proteins to bend; others cause protein to flatten.
All of these
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
Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that

both (a) and (b)
both chromatids of a chromosome were labeled
neither chromatid was labeled
only one chromatid of a chromosome was labeled

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