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The Cell Membrane is a Fluid Mosaic. A cell is the basic unit of life, and all organisms are made up of one or many cells. One of the things that all cells have in common is a cell membrane. It is a barrier that separates a cell from its surrounding environment. This outer boundary of the cell is also called the plasma membrane.
CH 7 Membranes Cellular Membranes Phospholipids are the most abundant lipid in the plasma membrane. Phospholipids are amphipathic molecules, containing hydrophobic and hydrophilic regions.The fluid mosaic model states that a membrane is a fluid structure with a âmosaicâ of various proteins embedded in it.Made of Proteins & Lipids Fluidity of Membranes Phospholipids in the plasma membrane can move within the bilayer.Most of the lipids, and some proteins, drift laterally.he fluid mosaic model states that a membrane is a fluid structure with a âmosaicâ of various proteins embedded in it. Made of Proteins & Lipids Fluidity of Membranes Phospholipids in the plasma membrane can move within the bilayer. Most of the lipids, and some proteins, drift laterally.