DNA Structure and Replication
Which of the following species lack a 'classical' histone H1?

Arabidopsis thaliana
Saccharomyces cerevisiae
Xenopus laevis
Strongylocentrotus purpuratus

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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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