CellDivision

CellDivision - 2007-2008AP BiologyBi ol ogy i s t he onl y...

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Unformatted text preview: 2007-2008AP BiologyBi ol ogy i s t he onl y s ubj ect i n whi ch mul t i pl i cat i oni s t he s ame t hi ng as di vi s i on…2007-2008AP BiologyThe Cell Cycle:Cell Growth, Cell DivisionAP BiologyWhere it all began…You started as a cell smaller than a period at the end of a sentence…AP BiologyAnd now look at you…How di d you get f r omt her e t o her e?AP BiologyGoing from egg to baby….the original fertilized egg has to divide… and divide…and divide…and divide…Getting from there to here…AP BiologyFor reproductionasexual reproductionone-celled organismsFor growthfrom fertilized egg to multi-celled organism For repair & renewalreplace cells that die from normal wear & tear or from injuryWhy do cells divide?amoebaQuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.AP BiologyMaking new cells NucleuschromosomesDNACytoskeletoncentriolesin animalsmicrotubule spindle fibersAP Biologynuclearporesnuclearporenuclear envelopenucleolushistone proteinchromosomeDNAFunctionprotects DNAStructurenuclear envelopedouble membranemembrane fused in spots to create poresallows large macromolecules to pass throughNucleusWhat ki nd of mol ecul es need t o pass t hr ough? AP BiologyAP BiologyCytoskeleton Functionstructural supportmaintains shape of cellprovides anchorage for organellesprotein fibersmicrofilaments, intermediate filaments, microtubulesmotilitycell locomotioncilia, flagella, etc.regulationorganizes structures & activities of cellAP BiologyactinmicrotubulenucleiCytoskeleton AP BiologyCentrioles Cell divisionin animal cells, pair of centriolesorganize microtubulesspindle fibersguide chromosomes in mitosisAP BiologyEnd of t he TourAP BiologyGetting the right stuff What is passed on to daughter cells?exact copy of genetic material = DNAmitosisorganelles, cytoplasm, cell membrane, enzymescytokinesischromosomes (stained orange)in kangaroo rat epithelial cell→notice cytoskeleton fibersAP BiologyOverview of mitosisinterphaseprophase(pro-metaphase)metaphaseanaphasetelophasecytokinesisI.P.M.A.T.AP BiologyInterphase90% of cell life cycle...
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This note was uploaded on 10/22/2011 for the course BIOL 1 taught by Professor B during the Spring '11 term at Texas Tech.

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CellDivision - 2007-2008AP BiologyBi ol ogy i s t he onl y...

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