IMCB_Notes_CH.4

IMCB_Notes_CH.4 - 9-9-08Chapter 4Prokaryotic CellsBacteria...

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Unformatted text preview: 9-9-08Chapter 4Prokaryotic CellsBacteria and ArchaeaProkaryotesGenetic material not enclosed with a membraneAbsence of other membrane-enclosed organellesCell division by binary fissionSmall; <1.0-3.0 micrometers in diameterComprised of bacteria and archaeaProkaryotic CellExternal structuresoGlycocalyx Capsule or slimeoFlagellaoFimbriae and PiliInternal structuresoCytoplasmoNucleoidoRybosomesFlagellaoLong, whip-like structures that extend beyond surface of celloResponsible for movementoPresent in some bacteriaArrangements of FlagellaoMonotrichousSingle polar flagellumoLophotrichousTwo or more flagella at one or both ends of the celloAmphitrichousA single flagellum or a tuft of flagella on each end of the celloPertrichousFlagella distributed over the entire cellStructure of FlagellaoBasal body anchors the flagellum to the cell wall and plasma membraneoHook anchors the flagellum to the cell walloFilament outermost region of the flagellum, composed of the protein flagellinoBacteria creates the flagellaAttachment of FlagellaoGram positiveo pair of ringsonly inner pair is presentBacterial MovementRotaion of flagellumClockwise tumbleCounter clockwise swim forwardChemotaxis in bacteriaMotility of bacteria enables them to move towards or away from the environmental stimuli Taxis-chemotaxis chemical stimulus- phototaxis light as a stimulusBacteria contain receptors-pick up chemical stimuliAttractant towards the stimulus many runsRepellent many tumblesPeriplasmic flagella Axial FilamentAlso known as endoflagellaBundle of fibrils under the outer sheathAnchored at one end of the cellRotation of filaments causes spiral (corkscrew) motionTreponema pallidum syphilisAppendages for attachment FimbriaeSticky, proteinaceous, projectionsUsed by bacteria to adhere to one another, to hosts, and to substances in...
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IMCB_Notes_CH.4 - 9-9-08Chapter 4Prokaryotic CellsBacteria...

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