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

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

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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 top of a gel photograph
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

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