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Cell Membrane Is Made Up Of Molecules. The cell membrane is mostly made up of lipids phospholipids can move laterally and allow water and other small molecules to pass through into or out of the cell. The cell membrane structure is a fluid mosaic made of three types of organic molecules:
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Structure and composition of the cell membrane. While lipids help to give membranes their flexibility, proteins monitor and maintain the cell's chemical climate and assist in the transfer of molecules across the membrane. The cell membrane controls the movement of substances like nutrients and wastes across the membrane, into and out of the cell.
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Structure and composition of the cell membrane. With few exceptions, cellular membranes — including plasma membranes and internal membranes — are made of glycerophospholipids, molecules composed of glycerol, a phosphate group, and two fatty acid chains. Depending on the membrane’s location and role in the body, lipids can make up anywhere from 20 to 80 percent of the membrane, with the remainder being proteins. Lipid—that is, fatty—molecules constitute about 50% of the mass of most animal cell membranes, nearly all of the remainder being protein.
