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

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

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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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