DNA Structure and Replication
DNA helicase is used to

break a phosphodiester bond in DNA strand
interact the double helix closely
None of these
unwind the double helix

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DNA Structure and Replication
Nucleosome is

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

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