Define cell envelope and its modification in detail. In easy words
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CELL ENVELOPE
The cell envelope represents the outermost layer of the bacterial cell that has as general functions the protection of the cell, communication with the environment, maintenance of cellular shape, stability, and rigidity of the cell, as well as allowing appropriate metabolism, growth, and division of the cell. Important components of the cell envelope are carbohydrate-based and carbohydrate-containing macromolecules that contribute significantly to all of these functions, independent of which variation of the cell envelope occurs, i.e. Gram-positive, Gram-negative, mycobacterial, or archaeal. The Gram-positive, Gram-negative, and mycobacterial cell envelopes possess a general and typical architecture, whereas the archaeal cell envelope shows a broader variety of constructions and may be comprised of only a membrane.