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15 Cards in this Set
- Front
- Back
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Transport of water and solutes by individual cell
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such as root hairs
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Short distance transports from cell to cell
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at levels of tissue and organs
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Long distance transport
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within xylem and phloem at the level of the whole plant
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passive diffusion
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diffusion of a solute across a membrane down its electrochemical gradient - no metabolic energy is involved
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Active transport
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pumping of a solute against its electrochemical gradient- metabolic energy is expended- usually in the form of ATP
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most important transport proteins
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protein pumps
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contransport
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transport protein couples the passage of one solute to the passage of another
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Osmosis
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the net absorption of a water loss by a cell
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water potential
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combined effects of solute concentration and physical pressure are incorporated into a quantity
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Water flows
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from areas of higher potential to regions of lower potential
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the term water potential refers to water's potential energy
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the ability of water to do work from a region of higher to lower water potential
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Aquaporins
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transport proteins in the cell membrane that facilitate the diffusion of water - do not affect water potential
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Transmembrane route
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out of one cell, across a cell wall, and into another cell
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symplastic route
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via the continuum of cytosol
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Apoplastic route
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via the cell walls and extracellular spaces
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