[PL SC221] - Final Exam Guide - Comprehensive Notes for the exam (24 pages long!)

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28 Nov 2016
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Water always wants to minimize it"s surface (surface tension), it is important to remember this when thinking about xylem. Diffusion: passive movement of particles along a gradient from high to low concentration. Osmosis: movement of water through a semipermeable membrane. The semipermeable membrane is in the plasma membrane, right underneath the cell wall. Osmosis can generate turgor pressure [turgor is a high water pressure] Turgor pressure provides structural support to herbaceous (non-woody) plants. Without aquaporins, water can diffuse through the semi-permeable membrane, however it"s very very slow. Water flow through cell membranes is facilitated by aquaporins. They are not pumps, they don"t take water molecules and move them through the membrane, water will always move passively through an osmotic gradient. Determines the direction of water movement in living systems; water moves from less negative to more negative water potentials. It"s either a zero, or a negative number.

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