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Lecture 22

BI111 Lecture Notes - Lecture 22: Osmosis, Covalent Bond


Department
Biology
Course Code
BI111
Professor
Tristan Long
Lecture
22

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PLANT TRANSPORT FEB 29 2016
PASSIVE AND ACTIVE MECHS
oSimplest passive transport simple diusion
oNo metab energy
oDown con/electrochem gradient
oNot for long distances tall trees? Not ecient
ACTIVE TRANSPORT MECHS
oREQS metab energy
oH + pump
oH + gradient ATP use maintains it
oH + diusion in cell gives power to take in solutes
oSlightly neg charge
oElecrochem grad made by H+ pumping cations coming thru selective channel prots
oSYMPORT
oMat go in same direction as H+ and solute movement, org uptake
oANTIPORT
oMat go in opp direction to H+ and solute, Na+ export
oReturn is coupled to movement of another mat
DIFFUSION AND OSMOSIS
oDiusion:
ospon movement of mols or particles along con grad
oOsmosis: special diusion
owater mol diuse across sel perm mem
ohigher water con lower water con
olow solute con higher solute con
CONSEQUENCES OF GRADIENTS
ohypertonic HIGH SOLUTES OUTSIDE shrivel WATER OUT
oisotonic EQUAL SOL IN AND OUT same WATER IN AND OUT
ohypotonic LOWER SOLUTES OUTSIDE 2ll up or burst WATER IN
oplants beat ani cells bc of cell walls
Rigidity and turgor pressure to stop water intake, ani cells burst
TRANSPORT ROUTES IN PLANTS
oplants use xylem for water and mins, phloem for sugar and solutes
odo this with WATER
PROPERTIES OF WATER MOLECULES
oh bonds, weaker than covalent loose network of these bonds
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