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Chromosome: Difference between revisions
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The structure of the chromosome consist of two long strands of [[Deoxyribonucleic Acid]] (DNA) that are bound together, and twisted into the shape of a helix. The DNA helix is organized additionally by becoming wrapped around proteins called [[histones]] forming a DNA-protein complex known as a nucleosome. During [[cell division]], the nucleosomes coil further into a dense, visible (stainable) mass of [[DNA]] most people think of as a chromosome. | The structure of the chromosome consist of two long strands of [[Deoxyribonucleic Acid]] (DNA) that are bound together, and twisted into the shape of a helix. The DNA helix is organized additionally by becoming wrapped around proteins called [[histones]] forming a DNA-protein complex known as a nucleosome. During [[cell division]], the nucleosomes coil further into a dense, visible (stainable) mass of [[DNA]] most people think of as a chromosome. | ||
In a eukaryotic cell the chromosome is contained within the organelle known as the [[cell nucleus|nucleus]]. Before the synthesis of DNA each of the chromosomes have only one double stranded DNA molecule: after the DNA has been replicated the two DNA molecules are called sister chromatids.(Purves, 196). | |||
== Variations Among Organisms == | == Variations Among Organisms == | ||
