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Unformatted text preview: ATP requiring process. For auxin transport to be successful, the following conditions are must be met: Diffusion of a polar molecule across the plasma membrane Carrier molecules for auxin located only at the basal (bottom) end of the cell Proton pumps must be present to remove H + from the cell, altering the pH gradient Weak acid ionization (Indole Acetic Acid, IAA, aka auxin (A), is a weak acid: A-+ H + = AH Auxin enters cells as IAAH passively, or as IAA-via active cotransport. IAAH dissociates within the cytosol and special auxin transport proteins in the basal end of the cell are needed to carry auxin through the plasma membrane to the top of the adjacent cell. Auxin destined for root tissue, however, moves through phloem sieve tubes....
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- Fall '09