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Transport Processes (Long-Distance Transport: Phloem (Two mechanisms seal…
Transport Processes
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Water Potential
Cells and Water Movement
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Incipient Plasmolysis is the point at which the protoplast has lost just enough water to pull slightly away from the wall.
If the cell has not reached equilibrium at the point of incipient plasmolysis and continues to lose water the protoplast will pull away from the wall and shrink.
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Water has free energy, for most chemicals this is called chemical potential.
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"Sigh Pie" is the osmotic potential, which is the effect that solutes have on water potential.
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Diffusion, Osmosis, and Active Transport
Diffusion is when the random movement of particles in solution causes them to move from areas of high concentration to areas of low concentration.
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Water molecules pass through all membranes, but they diffuse faster if the membrane has protein channels called aquaporins
Active Transport is when a membrane uses membrane-bound molecular pumps that use energy of ATP to force molecules across the membrane.
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