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9 diffusion and osmosis_prep
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9 diffusion and osmosis_prep

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  • 1. Thursday 9/19 1 (9)Before you arrive for the Diffusion and Osmosis lab, please 1. Read the lab thoroughly, noting all safety guidelines. 2. Answer these preparatory questions: What safety procedures should you be sure to follow during this lab period? _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ What causes Brownian movement?_______________________________________ Define diffusion?______________________________________________________ Name the factors that affect diffusion, and identify the factor that is most important in living things. ______________________________________________________________________ ______________________________________________________________________ Why are biological membranes and dialysis tubing considered to be differentially permeable? ______________________________________________________________________ Why would a nonpolar molecule pass across a cell membrane more readily than a polar molecule? Recall the “fluid mosaic model” of membrane structure as you answer this question. ______________________________________________________________________ ______________________________________________________________________ Which property of a molecule allows it to pass through dialysis tubing, while other molecules can not pass through the dialysis tubing? _____________________________________________________________________ What color is phenolphthalein in a basic solution?__________________________
  • 2. Thursday 9/19 2 What color is produced when iodine is combined with starch?________________ What is the difference between osmosis and diffusion?______________________ _____________________________________________________________________ Consider the beaker and model cell above. Both the cell and environment (beaker) contain sucrose solutions. The model cell is impermeable to sucrose, but is permeable to water. Is the cell hypertonic, hypotonic, or isotonic to the solution in the beaker?______ Will the cell shrink or swell?_____________________________________________ By what process will this occur?__________________________________________ What is water potential?________________________________________________ If water potential in an environment is higher than its surroundings, does water flow into or out of that environment? _____________________________________________________________________ Imagine some cut flowers sitting in water. For water to move through the stems to the upper leaves, where must water potential be higher--in the stem, or in the leaves? ______________________________________________________________________ 95% water 20% Sucrose
  • 3. Thursday 9/19 3 If you were given an IV solution in the hospital that was hypertonic to your blood, what could happen to your red blood cells? ______________________________________________________________________ ______________________________________________________________________