Solute and Water Movement

Solute and Water Movement - + difference in electrical...

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Three important implications of plant cell walls for transport in plants 1. Plant cell walls provide resistance to influx of water to the cell – positive pressure builds in plant cells 2. Plant primary cell walls are primarily composed of cellulose, a hydrophilic molecule – water, polar molecules and ions flow freely through plant cell walls 3. Plant cell walls have holes in them (plasmodesmata) that allow a continuous cytoplasmic connection from one plant cell to the next – once a molecule crosses the plasma membrane of one plant cell it has access to all the cells of the plant
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Movement of solutes across membranes is determined by the electrochemical gradient for that solute Electrochemical gradient = difference in solute concentration
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Unformatted text preview: + difference in electrical charge Solutes move from areas of higher to lower concentration Solutes move from regions of like electrical charge to regions of opposite electrical charge Water moves down osmotic gradients from regions of more dilute solutions to regions of more concentrated solutions BUT in plant cells, movement of water is also determined by physical pressure because of the inelasticity of plant cell wall Water potential combined effects of solute concentration and physical pressure upon the movement of water = s + p Water always moves from regions of relatively positive water potential to regions of relatively negative water potential...
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Solute and Water Movement - + difference in electrical...

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