dp cell membrane transport unit 6 - christina bowers, ph.d. · 1.4.u1 particles move across...
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UNIT6:CellMembraneTransport Name:_____________________EssentialIdea(s):Membranescontrolthecompositionofcellsbyactiveandpassivetransport
IBAssessmentStatements
1.1.U3 CellSurfacetovolumeisanimportantlimitationtocellsize.• Outlinetheactivitiesoccurringinthevolumeandatthesurfaceofthecell.• Calculatethesurfacearea,volumeandSA:Vratioofacube.• Explainthebenefitsandlimitationsofusingcubestomodelthesurfaceareaandvolumeofacell.• DescribetherelationshipbetweencellsizeandtheSA:Vratioofthecell.• ExplainwhycellsareoftenlimitedinsizebytheSA:Vratio.• ListthreeadaptationsofcellsthatmaximizetheSA:volumeratio.
1.4.U1 Particlesmoveacrossmembranesbysimplediffusion,facilitateddiffusion,osmosisandactivetransport.• Describesimplediffusion.• Explaintwoexamplesofsimplediffusionofmoleculesintoandoutofcells.• Outlinefactorsthatregulatetherateofdiffusion.• Describefacilitateddiffusion.• Describeoneexampleoffacilitateddiffusionthroughaproteinchannel.• Defineosmosis.• Predictthedirectionofwatermovementbasedupondifferencesinsoluteconcentration.• Compareactivetransportandpassivetransport.• Explainoneexampleofactivetransportofmoleculesintoandoutofcellsthroughproteinpumps
1.4.S1 Estimationofosmolarityintissuesbybathingsamplesinhypotonicandhypertonicsolutions.• Defineosmolarity,isotonic,hypotonicandhypertonic.• Calculatethepercentagechangebetweenmeasurementvalues.• Calculatethemeanvalueofadataset.• Calculatethestandarddeviationvalueofadataset.• Statethatthetermstandarddeviationisusedtosummarizethespreadofvaluesaroundthemean,and
that68%ofthevaluesfallwithinonestandarddeviationofthemean.• Explainhowthestandarddeviationisusefulforcomparingthemeansandthespreadofdatabetweentwo
ormoresamples.• Determinethecorrecttypeofgraphtorepresentexperimentalresults.• Statethaterrorbarsareagraphicalrepresentationofthevariabilityofdata.• Accuratelygraphmeanandstandarddeviationofdatasets.• Determineosmolarityofasamplegivenchangesinmasswhenplacedinsolutionsofvarioustonicities.
1.4.NOS Experimentaldesign-accuratequantitativemeasurementinosmosisexperimentsisessential.• Definequantitativeandqualitative.• Determinemeasurementuncertaintyofameasurementtool.• Explaintheneedforrepeatedmeasurements(multipletrials)inexperimentaldesign.• Explaintheneedtocontrolledvariablesinexperimentaldesign.
1.4.A2 Tissuesororganstobeusedinmedicalproceduresmustbebathedinasolutionwiththesameosmolarityasthecytoplasmtopreventosmosis.
• Explainwhathappenstocellswhenplacedinsolutionsofthesameosmolarity,higherosmolarityandlowerosmolarity.
• Outlinetheuseofnormalsalineinmedicalprocedures
1.4.U2 Thefluidityofmembranesallowsmaterialstobetakenintocellsbyendocytosisorreleasedbyexocytosis.• Describethefluidpropertiesofthecellmembraneandvesicles.• Explainvesicleformationviaendocytosis.• Outlinetwoexamplesofmaterialsbroughtintothecellviaendocytosis.• Explainreleaseofmaterialsfromcellsviaexocytosis.• Outlinetwoexamplesofmaterialsreleasedfromacellviaexocytosis
SURFACEAREA:VOLUME(…whycellsaresmall…)
SURFACEAREACellsurfaceareadictates…Themoresurfacearea,themore…VOLUMECellvolumedictates…Themorevolume,themore….
Somecellsincreasesurfaceareatovolumeratiobyhaving… sketchanddescribe
Asacellbecomestoolarge….
SIMPLEDIFFUSION
DIFFUSIONIS:PHOSPHOLIPIDBILAYERMUSTBE:EXAMPLES:
DiffusionofCO2andO2intoandoutoflungalveoli
DiffusionofCO2andO2intoandoutofeyecorneacells
CAPTION:
Ratesofdiffusiondependon:
FACILITATEDDIFFUSION
FACILTATEDDIFFUSIONIS:PHOSPHOLIPIDBILAYERMUSTBE…EXAMPLE:
CAPTION:
OSMOSIS
OSMOSISIS:OSMOSISDEPENDSON…
HYPOTONIC
ISOTONIC HYPERTONIC
WhathappenstocellsplacedinHYPOTOMICSOLUTION
WhathappenstocellsplacedinISOTONICSOLUTION
WhathappenstocellsplacedinHYPERTONICSOLUTION
CAPTION:
ACTIVETRANSPORT
ACTIVETRANSPORTIS:PROTEINPUMPS:EXAMPLES:
SodiumPotassiumPumpinNeurons
ProtonPumpinCellularRespirationandPhotosynthesis
CAPTION: