DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

covalent bonds between the pair of bases
ionic bonds between the pair of bases
None of these
hydrogen bonds between the pair of bases

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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 bottom of a gel photograph
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

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