DNA Structure and Replication
The chromosomal DNA complexes with

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

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

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