DNA Structure and Replication
The size of a linear DNA fragment in a gel can be estimated by

fluorescence in UV light
the sedimentation coefficient
comparison with a molecular weight standard such as Hind III digested phage lambda
the time it takes the gel to run

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

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