Diffusion and Osmosis
On a blank sheet of paper TSWBAT identify the process of osmosis and diffusion via the gummi bear lab -analyze diffusion through a sand baggie and apply the concepts of hypotonic, hypertonic, and isotonic to the activity On a blank sheet of paper Write the equation for cellular respiration. Where does cellular respiration occur in the cell? List the organelles that help to make proteins What is the difference between the rough and the smooth endoplasmic reticulum?
Diffusion Solvent – what dissolve something Solute – what is being dissolved Solute molecules moving from an area of high concentration to an area of low concentration Random motion drives diffusion Movement is based on kinetic energy (speed), charge, and mass of molecules Equilibrium is reached when there is an even distribution of solute molecules http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html (water) 2 3 1 4
Osmosis Diffusion of water through a semi-permeable membrane Semi-permeable: permeable to solvents (WATER), but not to large molecules High [water] to low [water] Dissolved molecules (i.e. glucose, starch) are called solutes REMEMBER: Water = solvent Glucose, Starch = solutes http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html
Effect of Water on Cells Hypertonic Environment High [solute], low [water] The cell will shrink Plasmolysis – cell death Hypotonic Environment High [water], low [solute] Plants – turgor pressure – plant like this!! Animals – cytolysis – cell bursting Isotonic Environment [water] = [solute] Hypertonic Hypotonic Isotonic Part 3 pg. 85
Osmosis in Living Cells Cellulose in cell wall
Osmosis in Red Blood Cells Isotonic Hypotonic Hypertonic 0.9% saline 10% NaCl Distilled water Plasmolysis Predictions?
Osmosis in Plant Cells Plasmolysis . 10% NaCl Distilled water Hypertonic Plasmolysis . 10% NaCl Distilled water Hypotonic Predictions?
Animations Dialysis Bag Experiment http://ccollege.hccs.cc.tx.us/instru/Biology/AllStudyPages/Diffusion_Osmosis/Baggif.swf Elodea Cell http://ccollege.hccs.cc.tx.us/instru/Biology/AllStudyPages/Diffusion_Osmosis/Elodeagif.swf Osmosis http://ull.chemistry.uakron.edu/genobc/animations/osmosis.mov
Transportation of Molecules Passive Transport Movement of molecules across a semi-permeable membrane no energy required Active Transport Movement of molecules across a semi-permeable membrane against a concentration gradient with a protein ENERGY – ATP Facilitated Diffusion Movement of molecules across a semi-permeable membrane with a protein
Effect of Water on RBC