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The cell membrane and cell wall both serve as protective barriers for the cell. All cells possess a cell membrane, which is a selectively permeable phospholipid bilayer that regulates the passage of substances into and out of the cell. In contrast, only certain cells, such as plant cells, have a cell wall. The cell wall is a rigid outer layer made of cellulose that provides structural support and maintains the cell's shape, which is especially important for plants to stand upright.