Biology / Bio 0283 · Atom · ~20 seconds
The Plant Cell Wall
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The plant cell wall is a rigid covering outside the plasma membrane, built mainly from the polysaccharide cellulose, that protects the cell and gives it shape.
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Biting into raw celery crunches because teeth tear through the rigid cellulose walls of its cells.
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A plant wall's chief molecule, cellulose, differs from the peptidoglycan of most prokaryotic walls.