Chapter 3 Cells - 3-1Chapter 3Cell Structure and Function...

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Unformatted text preview: 3-1Chapter 3Cell Structure and Function 3-2Cell CharacteristicsPlasma MembraneOuter cell boundaryCytoplasmCytosolCytoskeletonCytoplasmic inclusionsOrganellesSpecialized structures that perform specific functions3-3Functions of the CellBasic unit of lifeProtection and supportMovementCommunicationCell metabolism and energy releaseInheritance3-43-5Plasma MembraneFlexible but sturdy barrier that surround cytoplasm of cellFluid mosaic model describes its structuresea of lipids in which proteins float like icebergsmembrane is 50 % lipid & 50 % protein held together by hydrogen bondslipid is barrier to entry or exit of polar substancesproteins are gatekeepers -- regulate traffic50 lipid molecules for each protein molecule3-6Lipid Bilayer of the Cell MembranePhospholipids form a lipid bilayerHydrophilic(water-loving) polar headsHydrophobic(water-fearing) nonpolar headsCholesterol: Determines fluid nature of membrane3-7Membrane ProteinsIntegral or intrinsicExtend from one surface to the otherPeripheral or extrinsicAttached to either the inner or outer surfaces of the lipid bilayer3-8Membrane ProteinsIntegral versus Peripheral Proteins3-9Marker MoleculesAllow cells to identify on another or other moleculesGlycoproteinsGlycolipidsExamples:Immune systemRecognition of oocyte by sperm cell3-10Channel ProteinsNongatedion channelsAlways openLigand gatedion channelOpen in response to small molecules that bind to proteins or glycoproteinsVoltage-gatedion channelOpen when there is a change in charge across the plasma membrane3-11ReceptorsReceptor moleculesExposed receptor siteLinked to channel proteinsAcetylcholineLinked to G proteinsAlter activity on inner surface of plasma membrane3-12Enzymes and Carrier Proteins3-13Movement through the Plasma MembraneDiffusionOsmosisFiltrationMediated transport mechanismsFacilitated diffusionActive transportSecondary active transport3-14DiffusionMovement of solutes from an area of higher concentration to lower concentration in solutionConcentration or density gradientDifference between two pointsViscosityHow easily a liquid flows3-15Examples of Diffusion3-16Diffusion3-17OsmosisDiffusionof water (solvent) across a selectively permeable membraneImportant...
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This note was uploaded on 06/06/2011 for the course BIO 180 taught by Professor Sarahbales during the Spring '11 term at Moraine Valley Community College.

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Chapter 3 Cells - 3-1Chapter 3Cell Structure and Function...

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