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

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

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DNA Structure and Replication
Nucleosome is

an hexamer of three histones with H1 protein
an octamer of four histones without H1 protein
an hexamer of three histones without H1 protein
an octamer of four histones with H1 protein

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