key concept6.1Biological Membranes Are LipidâProtein Bilayers
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Lipids form the hydrophobic core of the membrane
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Membrane proteins are asymmetrically distributed
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Membranes are constantly changing
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Cell membrane carbohydrates are recognition sites
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key concept6.2The Cell Membrane Is Important in Cell Adhesion and Recognition
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Cell recognition and adhesion involve proteins and carbohydrates at the cell surface
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Three types of cell junctions connect adjacent cells
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Cell membranes adhere to the extracellular matrix
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key concept6.3Substances Can Cross Membranes by Passive Processes
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Diffusion is the process of random movement toward a state of equilibrium
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Simple diffusion takes place through the phospholipid bilayer
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Osmosis is the diffusion of water across membranes
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Diffusion may be aided by channel proteins
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Carrier proteins aid diffusion by binding substances
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key concept6.4Active Transport across Membranes Requires Energy
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Active transport is directional
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Different energy sources distinguish different active transport systems
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key concept6.5Large Molecules Enter and Leave a Cell through Vesicles
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Macromolecules and particles enter the cell by endocytosis
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Receptor-mediated endocytosis is highly specific
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Exocytosis moves materials out of the cell
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Apply What Youâve Learned
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