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Lecture 8

BIOL 1201 Lecture Notes - Lecture 8: Membrane Transport Protein, Electrochemical Potential, Sodium ChloridePremium


Department
Biological Sciences
Course Code
BIOL 1201
Professor
Moroney, James
Lecture
8

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BIOL1201Lecture8Pumps,TransportandMetabolism
**clickerquestions**
Whichorganellehastwomembranessurroundingit?Mitochondria
WhichorganellehasDNA?Mitochondria
CO2caneasilycrossmembraneswithoutthehelpofaprotein..IfCO2leavesamuscle
cellwhatkindoftransportisoccurring?SimpleDiffusion
Glucoseentersthecellfromtheblood,goingfromahighconcentrationtoalow.A
membranetransportproteinhelpsglucosethroughthemembranewhatkindoftransport
isthis?FacilitatedTransport
Whenavesiclemergeswiththteplasmamembraneandsmallmoleculesleavethecell
thisprocessiscalledexocytosis
Pumps
● Solutesmovebyactivetransport
● EnergyfromATPhydrolysismoveionsagainstaconcentrationgradient
● MostcommonionstransportedbyATPasesareprotons(H
+
)
● Movementofionsmaychangechargebalanceacrossthemembrane
● Chargeimbalancecandrivethetransportofothermolecules
Electrogenicpumps(stillactivetransport)
● Movementofionsmaychangetheelectricchargeacrossthemembrane
● Thischargeimbalancecandrivethetransportofothermolecules
● Ionmostcommoninyourblood:SodiumChloride
CoupledTransportofMolecules
● Activetransportiscoupledwithfacilitateddiffusion
● ATPase(electrogenicpump)causesimbalanceincharge
● Thisimbalancehasaconcentrationandanelectricalcomponentandiscalledan
electrochemicalpotentialgradientacrossmembrane
● Electrochemicalpotentialgradientprovidesforceforfacilitateddiffusion
● 
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