Study Guide, Chapter 7

Study Guide, Chapter 7 - permeability will be either by...

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BSCI105, Freshman Connection Fall 2010 Study Guide #7 I. Membrane structure and Transport Vocabulary: Fluid mosaic Integral protein Peripheral protein Amphipathic Saturation Permeability Cholesterol Glycoprotein Diffusion Osmosis Passive transport Active transport Bulk transport Equilibrium Spontaneous Hypertonic Hypotonic Isotonic Turgor pressure Aquaporin Channel Carrier Ion channel Gated channel Uniport Symport Antiport Cotransport Endocytosis Phagocytosis Pinocytosis Exocytosis Key Concept 1: The fluid mosaic model describes the structure of the cell membrane, which consists of a fluid phospholipid bilayer and integral and peripheral proteins, glycoproteins, and glycolipids that may move freely or be anchored to the cytoskeleton. Key Concept 2: The fluidity or viscosity of the plasma membrane, as well as permeability, is influenced by the relative amounts of saturated and unsaturated phospholipids and the presence of cholesterol. Key Concept 3: Transport proteins in the membrane determine how selective membrane
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Unformatted text preview: permeability will be, either by facilitating diffusion or transporting molecules, passively or actively. Key Concept 4: Passive transport of molecules across the cell membrane is achieved by facilitated diffusion, using channel or carrier proteins that selectively allow solutes to move down a concentration gradient. Key Concept 5: Active transport requires energy to move solutes against a concentration or electrochemical gradient. Key Concept 6: Uniport transporters move individual solutes independently, while symport and antiport transporters depend on the cotransport of a coupled solute either in the same or opposite direction. Key Concept 7: Cells can take in bulk solutes through endocytic mechanisms, such as phagocytosis, pinocytosis, and receptor-mediated endocytosis. Key Concept 8: Cells export bulk materials through the plasma membrane by the process of eexocytosis....
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