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1. Definition of cell wallThe cell wall is a rigid layer that is located on the outside of the plasma membrane in cells of bacteria, fungi, algae and plants. The cell wall protects the contents of the cell, gives rigidity to the cell structure, works as a mediator in all relationships of the cell with the environment and acts as a cellular compartment. In addition, in the case of fungi and plants, it defines the structure and gives support to tissues and many more parts of the cell.
The cell wall is constructed of different materials depending on the class of organism. In plants, the cell wall consists mostly of a carbohydrate called cellulose, a polysaccharide, polymer and can also act as a store of carbohydrates for the cell. In bacteria, the cell wall is composed of Peptidoglycan. Between archaea have cell walls with different chemical compositions, including layer S of glycoproteins, pseudopeptidoglycan, or polysaccharides. Fungi have cell walls of chitin, and algae typically have built walls of glycoproteins and polysaccharides. However, some species of algae may have a cell wall composed of silicon dioxide. Often occur other accessory molecules embedded in the cell wall.
The plant cell wall is a structure or complex organelle which, apart from giving support to the plant tissue, has the ability to condition the development of cells. Like the cell walls of higher plants, algae cell wall is composed of carbohydrates such as cellulose and glycoproteins. The presence of some polysaccharides on the walls of algae, is used as a diagnostic character in the taxonomy of algae.Bacterial cell walls are made of Peptidoglycan (also called murein), which is formed by unusual criss-crossed by peptides polysaccharide chain containing d-amino acids Bacterial cell walls are different from the walls of plants and fungi which are made of cellulose and chitin, respectively. They are also different from the walls of Archaea, which do not contain Peptidoglycan. The cell wall is essential to the survival of many bacteria and the antibiotic penicillin can kill bacteria by inhibiting a step in the synthesis of the peptidoglicano.7No all species of fungi have cell walls, but in the event they have them, are composed of Glucosamine and chitin, the same CARB giving hardness to the exoskeletons of insects. They have the same purpose as the cell walls of plants, give rigidity to the cells to maintain their shape and preventing osmotic Lysis. It also limits the entry of molecules that can be toxic to the fungus, such as produced by plants or synthetic fungicides. The composition, characteristics and the shape of the cell wall of fungi varies during its life cycle and also depends on growing conditions.
2. Definition of cell wallThe Latin term parĭes led wall, a word of our language which has several meanings. You can treat a wall or anything that brings a limit to a surface or body. Cellular, for its part, is the adjective that points out what is linked to lascelulas (the fundamental element of a living being) or that mentions to a mobile phone.
Cell wall, therefore, is that which covers the prokaryotes cells and cells of the plants. It is a rigid mantle that sits outside of the plasma membrane, helping to train the cell structure and providing protection to its components. It is said that the cell wall is responsible for mediating between the cell and its environment.
The particularities of the cell wall vary between elorganismo in question. You can treat a layer dequitina (in the case of fungi), cellulose (plant), Peptidoglycan (bacteria) or other materials.
The cell walls of fungi given toughness to its structure and allow you to retain the shape. They also work as a barrier to prevent toxic elements that enter the fungus.
In plants, the cell wall provides support and can be divided, depending on the species, in wall elementary (that he is adapted to the development of cells), secondary (the sector closest to the plasma membrane) and middle lamella (space that links the cell walls primaries, a pair of cells located with contiguity).
Bacteria and algae also have cell walls with specific features and components.