BIO 185 Lecture 8: Lecture 8
Document Summary
Unit 2. 2 - vascular systems and gas exchange. Predict what will happen if two aqueous solutions with different concentrations of different solutes (a or b) were separated by a membrane that is permeable to only one solute. Predict what will happen when the cell is dropped into the solution. The cell membrane is fully permeable to sucrose but not to fructose. Cell: 0. 5m fructose, 0. 3m sucrose: no diffusion of fructose, diffusion of sucrose. (0. 1m, add up total amounts of solute inside and outside the cell (compare, movement of water into the cell (higher solute concentration inside cell) - osmosis. Transport in plants: diffusion is ef cient only for distances <1 millimeter remember: diffusion is driven by the concentration gradient short distances (relatively slow) Root pressure: water comes into the roots, creating a high water concentration in the roots (water potential, water will go up into the tree.
