BIOL 206 Study Guide - Final Guide: Solution, Apoplast, Grater
Document Summary
Possible questions for plant transport: what motivates the movement of materials? (transport) Concentration gradient (entropy driven: transport is mainly regulated by membranes over ________ distances. Diffusion (random molecular motion, only good over short distances. Pump, channel and carrier mediated transport ( transports ions/ small molecules across membranes) Bulk flow (efficient, long distance movement driven by hydrostatic pressure: diffusion is only good over _____distances. Pressure that is exerted by a fluid at equilibrium. Psi, the tendency of a solution (water plus solutes) to take up water across a membrane. Water potential of pure water is 0. Any solution that has a water potential less than zero has a tendency to take up water from pure water. The lower (more negative ) the water potential the greater the driving force for eater movement across the membrane: water moves across its gradient from ___ to ___ energy. Water potential = capillary potential + osmotic potential + pressure+ gravitational potential.
