In a eukaryotic chromosome, DNA is packaged by winding around proteins called
Correct answer: A. histones
- A. histones
- B. collagens
- C. tubulins
- D. keratins
Explanation
Histones are small positively charged proteins that bind the negatively charged phosphate backbone of DNA, forming nucleosomes that condense roughly two metres of DNA into a nucleus a few micrometres across. Tubulin builds microtubules, collagen is a structural protein of connective tissue, and keratin is found in hair and nails.
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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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