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1/25/12 Cell Structure 1
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Some Recent Work on the Structure of the Plant Cell Wall
Some Recent Work on the Structure of the Plant Cell Wall

... walls and the striation visible on many cell walls. The stratification is more or less distinct in cross section and its visibility varies with the water content of the wall, a fact which has led to the theory that differences in water content cause the stratification. The surface markings are of va ...
Some Recent Work on the Structure of the Plant Cell Wall
Some Recent Work on the Structure of the Plant Cell Wall

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Click Here to this File
Click Here to this File

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Cell wall



The cell wall is a tough, flexible and sometimes rigid layer that surrounds some types of cells. It surrounds the cell membrane and provides these cells with structural support and protection. In addition, the cell wall acts as a filtering mechanism. A major function of the cell wall is to act as a pressure vessel, preventing over-expansion when water enters the cell. Cell walls are found in plants, fungi and prokaryotic cells but not in mycoplasmas.The composition of the cell wall varies between species and may depend on cell type and developmental stage. The primary cell wall of land plants is composed of the polysaccharides cellulose, hemicellulose and pectin. In bacteria, peptidoglycan forms the cell wall. Archaean cell walls have various compositions, and may be formed of glycoprotein S-layers, pseudopeptidoglycan, or polysaccharides. Fungi possess cell walls made of the glucosamine polymer chitin, and algae typically possess walls made of glycoproteins and polysaccharides. Unusually, diatoms have a cell wall composed of biogenic silica. Often, other accessory molecules are found anchored to the cell wall.
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