AP BIOLOGY

Detailed explanation-1: -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-2: -The nucleosome is composed of an octameric core of histone proteins around which the DNA double helix is wrapped.

Detailed explanation-3: -Figure 1: Chromosomes are composed of DNA tightly-wound around histones. Chromosomal DNA is packaged inside microscopic nuclei with the help of histones. These are positively-charged proteins that strongly adhere to negatively-charged DNA and form complexes called nucleosomes.

Detailed explanation-4: -A type of protein found in chromosomes. Histones bind to DNA, help give chromosomes their shape, and help control the activity of genes. Enlarge. Structure of DNA. Most DNA is found inside the nucleus of a cell, where it forms the chromosomes.

Detailed explanation-5: -DNA molecules first wrap around the histone proteins forming beads on string structure called nucleosomes. Nucleosomes further [inaudible] and condense/gather to form fibrous material which is called chromatin.