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
The many different amino acid R groups on proteins confer many different shapes.
DNA has one main function in cells whereas proteins have many.
Some S amino acids cause proteins to bend; others cause protein to flatten.

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DNA Structure and Replication
Which of the following is used to determine the appropriate stringency (Wallace rule)?

Tm = 4 x (No.of G:C base pair) + 2 x (No.of A:T base pair)
Tm = 69.3° + 0.41 (%)G+C -650/1
Tm = 4 x (No.of A:T base pair) + 2 x (No.of G:C base pair)
Tm = 2 x (No.of G:C base pair) + 4 x (No.of A:T base pair)

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DNA Structure and Replication
In a typical electrophoresis experiment, larger fragments of DNA move more

slowly, so they appear nearer the bottom of a gel photograph
quickly, so they appear nearer the bottom of a gel photograph
quickly, so they appear nearer the top of a gel photograph
slowly, so they appear nearer the top of a gel photograph

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