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.
All of these
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.

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DNA Structure and Replication
In DNA, there are

three bases known as adenine, guanine and cytosine
five bases known as adenine, guanine, thymine, tryptophan and cytosine
four bases known as adenine, guanine, thymine and cytosine
only two bases known as adenine and cytosine

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