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

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

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

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

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