NEET BIOLOGY

Detailed explanation-1: -The answer to this question lies in the fact that certain proteins compact chromosomal DNA into the microscopic space of the eukaryotic nucleus. These proteins are called histones, and the resulting DNA-protein complex is called chromatin.

Detailed explanation-2: -Molecular. All DNA is packaged as structures called nucleosomes which are the basic unit of chromatin.[3] Nucleosomes are composed of double-stranded DNA wrapped around an octamer of histone proteins, including two of each of the following: H2A, H2B, H3, and H4.

Detailed explanation-3: -A histone is a protein that provides structural support for a chromosome. Each chromosome contains a long molecule of DNA, which must fit into the cell nucleus. To do that, the DNA wraps around complexes of histone proteins, giving the chromosome a more compact shape.

Detailed explanation-4: -Eukaryotic chromosome Eukaryotic chromosomes consist of DNA tightly wound around clusters of histone proteins. Chromatin consists of all the DNA in the nucleus, as well as its associated proteins. There are three basic layers of chromatin scaffolding that results in a condensed DNA molecule.

Detailed explanation-5: -In eukaryotes, the packaging of DNA inside the nucleus is very complex. The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called nucleosome. Nucleosomes in turn form the repeating unit called chromatin which are thread-like stained bodies.