DNA Structure and Replication
E.coli DNA polymerases II and III lack

5' → 3' exonuclease activity
partially 5' → 3' endonuclease activity
partially 5' → 3' exonuclease activity
5' → 3' endonuclease activity

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DNA Structure and Replication
Nucleosome is

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

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