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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
2
3
14
(water)
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 = solventGlucose, 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]
Isotonic
HypotonicHypertonic
Part 3 pg. 85
Osmosis in Red Blood Cells
Isotonic
Hypotonic
Hypertonic
• 0.9% saline
10% NaCl
Distilled water
Predictions?
Plasmolysis
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
- no energy required