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

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

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DNA Structure and Replication
In DNA, there are

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

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