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phospholipid bilayer  This illustration shows a phospholipid bilayer with proteins and cholesterol embedded in it Integral membrane Figure 1 The fluid mosaic model of the A biological membrane made up of two layers of lipid molecules is known as a lipid bilayer The polar portions of the molecules are highlighted in red in the

The lipid bilayer is a type of membrane that separates the cell from the environment and is made of two layers of phospholipids  Phospholipid bilayer Hydrophilic head! WATER! Hydrophobic tail! WATER! Fig 7-2 Phospholipid bilayer Membrane Structure: The Fluid Mosaic

The phospholipid bilayer consists of two layers of phospholipids, with a hydrophobic, or water-hating, interior and a hydrophilic, or water- Grendel reasoned that cell membranes must be phospholipid bilayers o The molecules in the bilayer are arranged such that the hydrophobic fatty acid tails are