DNA Structure and Replication
DNA gyrase in E. coli

can be inhibited with antibiotics
performs the same function as helicase in eukaryotes
adds positive supercoils to chromosomal DNA
is required only at the oriC site

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DNA Structure and Replication
Nucleosome is

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

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