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
the time it takes the gel to run
comparison with a molecular weight standard such as Hind III digested phage lambda

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DNA Structure and Replication
In DNA, there are

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
three bases known as adenine, guanine and cytosine

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