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J Immunol Res. Does nucleus contain DNA? Why the nucleus is the most important organelle? Why is nucleus not an organelle? Is nucleolus an organelle? Is nucleus a plant or animal cell? Is DNA a cell organelle? Is DNA a cell?
What parts of cell have DNA? Which type of DNA is commonly found inside the cell? What are the 3 forms of DNA? Previous Article How did the Pilgrims start Thanksgiving? Next Article What is the tempo of the Star Wars theme song? Back To Top. The nucleus is one of the most obvious parts of the cell when you look at a picture of the cell.
It's in the middle of the cell, and the nucleus contains all of the cell's chromosomes, which encode the genetic material. So this is really an important part of the cell to protect. The spherical nucleus typically occupies about 10 percent of a eukaryotic cell's volume, making it one of the cell's most prominent features. A double-layered membrane, the nuclear envelope, separates the contents of the nucleus from the cellular cytoplasm. The envelope is riddled with holes called nuclear pores that allow specific types and sizes of molecules to pass back and forth between the nucleus and the cytoplasm.
It is also attached to a network of tubules and sacs, called the endoplasmic reticulum, where protein synthesis occurs, and is usually studded with ribosomes see Figure 1. The semifluid matrix found inside the nucleus is called nucleoplasm.
Within the nucleoplasm, most of the nuclear material consists of chromatin, the less condensed form of the cell's DNA that organizes to form chromosomes during mitosis or cell division. The nucleus also contains one or more nucleoli, organelles that synthesize protein-producing macromolecular assemblies called ribosomes, and a variety of other smaller components, such as Cajal bodies, GEMS Gemini of coiled bodies , and interchromatin granule clusters.
Chromatin and Chromosomes - Packed inside the nucleus of every human cell is nearly 6 feet of DNA, which is divided into 46 individual molecules, one for each chromosome and each about 1. Packing all this material into a microscopic cell nucleus is an extraordinary feat of packaging. For DNA to function, it can't be crammed into the nucleus like a ball of string. Instead, it is combined with proteins and organized into a precise, compact structure, a dense string-like fiber called chromatin.
The Nucleolus - The nucleolus is a membrane-less organelle within the nucleus that manufactures ribosomes, the cell's protein-producing structures. Through the microscope, the nucleolus looks like a large dark spot within the nucleus.
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