Many organelles are surrounded by membranes that form compartments. These compartments allow the cell to separate various processes.
Most cells are bounded by a thin plasma membrane that protects the cell and regulates the passage of materials into and out of the cell.
The plasma membrane consists of a double layer of lipids in which proteins are embedded. Many of the lipids are phospholipids, lipids that contain phosphorus. The positions of the proteins change as they move about like icebergs in a fluid sea of phospholipids. Some of the proteins form channels that selectively permit the passage of certain substances through the membrane.
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