BIO 1151 Chapter 7

BIO 1151 Chapter 7 - • Osmosis movement of water to...

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BIO 1151 Chapter 7 Cell Membranes Phosolipids make up most of the plasma membrane Phosolipids are amphipathic molecules, with hydrophilic heads and hydrophobic tails Most dirft laterally, rarely flip flopping\Cholosterol- when warm it restrains phosolipids. When cool, it maintains fluidity Proteins Many proteins are embedded in the lipid bilayer 6 Protein Functions: Transport, Enzymatic activity, Signal transduction, Cell - Cell recon, Intercellular joing, attach cytoskeleton to ECM Cars bond to form glycolipids and glycoproteins Membrane Selectivity Hydrophobic molecules- hydrocarbons pass threw quickly Hydrophillic - sugars- do not Protein is specific for the substance it moves Diffusion + Osmosis Diffusion- molecules to spread out evenly in avaible space Molecules move down their concentration gradient until they balance Passive transport requires no energy
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Unformatted text preview: • Osmosis- movement of water to balance itself against 2 solutions. solute concentration does not matter • Osmoregulation- the balancing of water in living things • Hypotonic, Isotonic, Hypertonic solutions Active Transport/Diffusion • Moves substances up the concentration gradient useing energy, ATP • Done by specific proteins in the membrane • Sodium-potassium pump uses ATP to move H+ to a higher concertration graident • Contranspot- when active transport indirectly drives another element to transport • Proton Pump-hydrogen pump- drives out hydrogen and allows other nutrients into the cell • Endocytosis- take in molecules by forming vesciles • Exocytosis- expels molecules by forming vesciles • Phagocytosis- engulfs and forms a vacoule around food and organelles, bonds with a lysosome to also break down damaged organelles...
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This note was uploaded on 02/26/2011 for the course BIO 1151 taught by Professor Robinson during the Spring '09 term at College of DuPage.

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BIO 1151 Chapter 7 - • Osmosis movement of water to...

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