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Exam (elaborations)

BIOL 253 Exam 1 Study Guide | Complete Notes & Key Concepts for Exam 1

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Ace your BIOL 253 Exam 1 with this clear and comprehensive study guide. This document includes well-organized notes, key concepts, and essential topics designed to help you understand the material quickly and perform confidently on your exam. Perfect for students looking for efficient revision, this resource is ideal for both first-time study and last-minute exam preparation.

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Biolghn253ghnExamghn1



universalghnfunctionghnofghnmembranesghn-
ghnCORRECTghnANSWER✔toghnactghnasghnaghnselectiveghnbarrierghntoghntheghnpa

ssageghnofghnmolecules


functionsghnofghnplasmaghnmembranesghn-
ghnCORRECTghnANSWER✔1.ghnregulateghnpassageghnofghnsubstancesghninghnan

dghnoutghnofghncellsghnandghnbetweenghncellghnorganellesghnandghncytosol
2.ghndetectghnchemicalghnmessengersghnarrivingghnatghntheghncellghnsurface
3.ghnlinkghnadjacentghncellsghntogetherghnbyghnmembraneghnjunctions
4.ghnanchorghncellsghntoghntheghnextracellularghnmatrix


integralghnmembraneghnproteinghn-
ghnCORRECTghnANSWER✔closelyghnassociated ghnwithghnmembraneghnlipids




can'tghnbeghnextractedghnfromghntheghnmembraneghnwithoutghndisruptingghntheghnlip
idghnbilayer


amphipathicghn(polarghnout,ghnnonpolarghnin)


someghncanghnmoveghnlaterallyghnbutghnothersghncan'tghnbecauseghntheyghnareghnlinke
dghntoghnperipheralghnproteins

,transmembraneghnproteinsghn-
ghnCORRECTghnANSWER✔Integralghnproteinsghnthatghnspanghntheghnmembra

ne.


peripheralghnmembraneghnproteinsghn-
ghnCORRECTghnANSWER✔locatedghnonghnmembraneghnsurfaceghnandghnareghn

boundghntoghntheghnpolarghnregionsghnofghnintegralghnproteins


notghnamphipathic


glycoalyxghn-
ghnCORRECTghnANSWER✔layerghnofghnstickyghncarbohydratesghncoveringghn

plasmaghnmembrane,ghnprovidesghnstrength,ghnattachmentghnandghncellghncellghnre
cognition,ghnanchoredghntoghntheghnplasmaghnmembraneghnbyghncarbohydratesghnb
ondedghntoghnproteinsghnandghnlipidsghninghntheghnmembrane


fluidghnmosaicghnmodelghn-
ghnCORRECTghnANSWER✔modelghnthatghndescribesghntheghnarrangementghna

ndghnmovementghnofghntheghnmoleculesghnthatghnmakeghnupghnaghncellghnmembrane


lipidghnraftsghn-ghnCORRECTghnANSWER✔cholesterol-
richghnregionsghnofghnreducedghnmembraneghnfluidityghnthatghnareghnbelievedghntoghn
serveghnasghnorganizingghncentersghnforghntheghngenerationghnofghncomplexghnintrac
ellularghnsignals

,integrinsghn-
ghnCORRECTghnANSWER✔Aghntransmembrane ghnproteinghnthatghninterconn

ectsghntheghnextracellularghnmatrixghnandghntheghncytoskeleton.


Desmosomesghn-
ghnCORRECTghnANSWER✔Anchoringghnjunctionsghnthatghnpreventghncellsghn

fromghnbeingghnpulledghnapart


Cadherinsghn-
ghnCORRECTghnANSWER✔proteinsghnthatghnextendghnfromghntheghncellghnintog

hntheghnextracellular ghnspace,ghnwhereghntheyghnlinkghnupghnandghnbindghnwithghncad

herinsghnfromghnanghnadjacentghncell


tightghnjunctionghn-
ghnCORRECTghnANSWER✔junction ghnthatghnformsghnbetweenghntwoghnadjace

ntghnplasmaghnmembranesghntoghnremoveghnextracellularghnspaceghnbetweenghnthe
m


occursghninghnaghnbandghnaroundghntheghnentireghncircumferenceghnofghntheghncell


gapghnjunctionsghn-
ghnCORRECTghnANSWER✔proteinghnchannelsghnthatghnlinkghntheghncytosolsghn

ofghnadjacentghncells
ghn


limitsghnwhatghncanghnpassghnbetweenghntheghncytosolsghnofghntheghnconnectedghncel
lsghntoghnsmallghnmoleculesghnandghnions

, simpleghndiffusionghn-
ghnCORRECTghnANSWER✔movementghnofghnaghnsoluteghnfromghnanghnareaghno

fghnhighghnconcentrationghntoghnanghnareaghnofghnlowghnconcentration


fluxghn-
ghnCORRECTghnANSWER✔theghnamountghnofghnmaterialghncrossingghnaghnsurf

aceghninghnaghnunitghnofghntime


netghnfluxghn-ghnCORRECTghnANSWER✔differenceghnbetweenghntwoghnone-
wayghnfluxes


determinesghnnetghngainghnforghncompartmentghn2ghnandghnnetghnlossghnforghncompar
tmentghn1


alwaysghngreaterghnfromghnregionsghnofghnhigherghnconc.ghntoghnlowerghnconc.


diffusionghnequilibriumghn-
ghnCORRECTghnANSWER✔stateghnduringghnwhichghndiffusionghnfluxesghninghn

oppositeghndirectionsghnareghnequal;ghnthatghnis,ghntheghnnetghnfluxghnequalsghnzero


factorsghnthatghnaffectghnnetghnfluxghn-
ghnCORRECTghnANSWER✔1.ghntemperature:ghnhigherghntempghn=ghnfasterghnn

etghnflux
2.ghnmassghnofghnmolecule:ghnlargerghnmoleculeghn=ghnslowerghnnetghnflux
3.ghnsurfaceghnarea:ghngreaterghnsurfaceghnareaghn=ghnfasterghnnetghnflux
4.ghnmedium:ghnairghn=ghnfasterghnnetghnflux

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