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Unformatted text preview: Chapter 5-7 Review Chapter 5 Membranes are composed of a phospholipids bilayer as well as proteins. The phospholipids are unsaturated fats that have kinks, and therefore keep the membrane in a liquid state because they are unable to pack tightly together. The proteins that compose parts of the membrane have a multitude of functions. Some act as receptors, some act as enzymes, some as transport channels, and some act as integrins, which bind to the extracellular matrix. The chemical properties of the membrane that only allow certain molecules to pass through while not allowing other ones to do so is called SELECTIVE PERMEABILITY . Nonpolar molecules can move through easily, while polar molecules do not cross easily. DIFFUSION is the movement of molecules from an area of a higher concentration to an area of lower concentration down their concentration gradient. Any process that does not require energy to occur is considered to be PASSIVE TRANSPORT The movement of water across selectively permeable membranes is called OSMOSIS....
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