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This 2 page Class Notes was uploaded by Kristina Cowan on Tuesday November 3, 2015. The Class Notes belongs to BIOL1081 at The University of Cincinnati taught by Heather Wilkins in Fall 2015. Since its upload, it has received 13 views. For similar materials see Biology 1 in Science at The University of Cincinnati.
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Date Created: 11/03/15
Bio Exam 2 Notes Passive Transport 0 Diffusion o Tendency for molecules to spread out easily into space 0 No requirement of extra energy 0 Substances move down concentration gradient 0 Equilibrium o Gases like carbon dioxide an diffuse enter and exit with diffusion o Osmosis o Subcategory of diffusion o Diffusion of WATER high to low concentration of H20 I Low concentration less solute more water I High concentration more solute less water 0 Other concentrations I Isotonic solute concentration is equal not net gain or loss of H20 09 NaCl dimpled appearance I Hypotonic solution has lower solute concentration compared to another cell gains HZO cytolysis hemolysis cell swells I Hypertonic solution has higher solute concentration more energy cell loses HZO plasmolysis cell shrivels up 0 Facilitated transport or diffusion high to low concentration 0 Small molecules not lipid soluble o Molecules follow concentration gradient 0 Requires transport carrier protein 0 Energy not required passive transport 0 Active transport 0 Characteristics I Moleculesions combine ex sodiumpotassium pump protein pump 0 Cotransport I Membrane transport protein I Occurs when active transport of solute indirectly drives transport of other solutes 0 Bulk Transport different from all other types 0 Characteristics I Large molecules cross membrane by vesicles I Require energy I Don t go through phospholipid bilayer hydrophobic core 0 Exocytosis I Molecules exit cell to membrane I Fuse and release contents 0 Secretion by cells 0 Endocytosis I Molecules in go in cell by forming new vesicles from the plasma membrane 0 Three types I Phagocytosis eating engulfing I Pinocytosis quotcellular drinking liquid molecules smaller molecules I Receptormediated endocytosis bind to target molecule outside of the cell and bring in vesicle
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