8.4: Chromosomes and Chromatin - Biology LibreTexts
2023年7月13日 · When stained and viewed in a microscope, eukaryotic nuclear DNA in nondividing cells is observed in two different states, heterochromatin (dark areas) and euchromatin (light areas), as shown in Figure \(\PageIndex{1}\). Figure \(\PageIndex{1}\): Nucleus showing heterochromatin (dark) and euchromatin (light).
Chromosomes and Chromatin - The Cell - NCBI Bookshelf
In interphase (nondividing) cells, most of the chromatin (called euchromatin) is relatively decondensed and distributed throughout the nucleus (Figure 4.11). During this period of the cell cycle, genes are transcribed and the DNA is replicated in preparation for cell division.
Chromatin - Wikipedia
Chromatin is a complex of DNA and protein found in eukaryotic cells. [1] The primary function is to package long DNA molecules into more compact, denser structures. This prevents the strands from becoming tangled and also plays important roles in reinforcing the DNA during cell division , preventing DNA damage , and regulating gene expression ...
10.1C: Eukaryotic Chromosomal Structure and Compaction
2024年11月23日 · In the third level of packing, a variety of fibrous proteins is used to pack the chromatin. These fibrous proteins also ensure that each chromosome in a non-dividing cell occupies a particular area of the nucleus that does not …
Chromosomes | Learn Science at Scitable - Nature
However, when eukaryotic cells are not dividing — a stage called interphase — the chromatin within their chromosomes is less tightly packed. This looser configuration is important because it ...
7.2: Chromosomes and DNA Packaging - Biology LibreTexts
2022年7月30日 · When a cell divides, it is essential that the new cell (also known as the daughter cell) contains the same genetic information as the old cell (also known as the parent cell). This genetic information is our DNA, which is packaged into chromosomes. Each chromosome contains information about specific traits of an organism.
Controlling the double helix - Nature
2003年1月23日 · In dividing cells, the chromatin complex of DNA and protein can be seen as individual compact chromosomes; in non-dividing cells, chromatin appears to be distributed throughout the...
Chromosomal DNA and Its Packaging in the Chromatin Fiber
During the portions of the cell cycle when the cell is not dividing, the chromosomes are extended and much of their chromatin exists as long, thin tangled threads in the nucleus so that individual chromosomes cannot be easily distinguished (Figure 4-21).
chromatin | Learn Science at Scitable - Nature
Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. Nuclear DNA does not appear in free linear strands; it is highly condensed and wrapped...
3 DNA, Chromosomes, and the Interphase Nucleus - Open …
Chromatin is a complex of DNA and proteins that helps keep the DNA organized inside the nucleus. If the cell plans to undergo meiosis or mitosis, then the DNA will be replicated so that each chromosome now is composed of two identical sister chromatids, which are exact copies of each other and are connected to each other via the centromere.