DNA Structure and Replication
The chromosomal DNA complexes with

five types of histone as H1, H2A, H2B, H3 and H4
two types of histone as H1 and H4
three types of histone as H1, H2A and H4
four types of histone as H1, H2A, H3 and H4

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DNA Structure and Replication
In DNA, nucleotides are covalently joined together by

3', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 3' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain
3', 4' phosphodiester bonds to form a repetitive sugar-phosphate chain

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

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

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