Explanation:
DNA (Deoxyribonucleic acid) is the repository of genetic information in living things. It is biological macromolecule made up of several units called nucleotides. In Eukaryotic cells (organisms with membrane-bound nucleus), the DNA is found in the nucleus. This is however different in prokaryotic cells, as the DNA is found in a nucleus-like body in the cytosol called the nucleoid. In Eukaryotes DNA is ordered and packed by structural proteins called histones. A histone is a protein that provides structural support to a chromosome. In order for very long DNA molecules to fit into the cell nucleus, they wrap around complexes of histone proteins, giving the chromosome a more compact shape.