An octamer of 4 histones complexed with DNA forms a:
Correct answer: B. Nucleosome
- A. Endosome
- B. Nucleosome
- C. Mesosome
- D. Centromere
Explanation
An octamer of 4 histones complexed with DNA forms a nucleosome. The association of histones with DNA is very characteristic. It involves the formation of a linear array of spherical structures called nucleosomes. These structures contain four pairs of histones (H2A, H2B, and H4) in a ball; around which is wrapped a stretch of about 150 base pairs of DNA.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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