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Agenda Catalyst Permeability Cell membrane Objectives

Catalyst: (pg. 44)What’s the difference between something that is permeable and something that ’ s impermeable?? . Agenda Catalyst Permeability Cell membrane Objectives Explain selective permeability in reference to the cell membrane Identify the parts of the phospholipid bilayer .

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Agenda Catalyst Permeability Cell membrane Objectives

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  1. Catalyst: (pg. 44)What’s the difference between something that is permeable and something that’s impermeable??

  2. Agenda • Catalyst • Permeability • Cell membrane • Objectives • Explain selective permeability in reference to the cell membrane • Identify the parts of the phospholipid bilayer

  3. Permeability • Permeable– Allows any substance to pass through • Impermeable- does not allow any substance to pass through • Selectively permeable- Some substances make it through others get stopped • With a partner discuss which type of permeability will most likely be experienced in your cells. Use an example to explain why you are confident in your choice.

  4. Cells and Permeability • Cells are SELECTIVLY PERMEABLE • Its important that they don’t just let anything get access to the organelles or your DNA • What sorts of things shouldn’t be allowed into your cells? • Viruses, bacteria or other things that make you sick • Ions- charged particles can damage cells • What sort of things should your cells allow inside? • Water • Food molecules (proteins, lipids and carbohydrates) • Salts • Vitamins and Minerals

  5. Cell membrane • The cell membrane is the organelle that allows the cell to be SELECTIVLY PERMEABLE • The cell membrane is called the PHOSPHOLIPID BILAYER

  6. Phospholipid Bilayer

  7. Homework • READ & TAKE NOTES on “Membranes” essay pg. 220-221 • DEFINE vocabulary in essay • PG. 45 of your notebook

  8. Phospholipid Bilayer

  9. Catalyst: (Pg. 46)What is the full scientific name of the cell membrane? • Agenda • Catalyst • Finish membranes • Molecular movement • Objectives: SWBAT • Explain how diffusion and osmosis move molecules across the cell membrane.

  10. Phospholipid Bilayer Video • http://www.youtube.com/watch?v=moPJkCbKjBs

  11. Molecular Movement • You will be divided up into groups and given a quote. • With your group discuss the meaning of the words in the quote. • Annotatethe quote on the paper, write down any questions you have about words or meaning. • Find the quote in your text and read the paragraph that it’s found in to gain context. • Write a Summary of what your group thinks your quote means on the paper with your quote.

  12. Gallery walk • Glue the small sheet with all of the quotes onto pg. 46 of your notebook, in the corner against the binding. • Walk around the room and look at what other groups said about their quotes. • Summarize the quote in your notebook on pg. 46

  13. Catalyst:pg.47 (insert solvent and solute to complete the sentence.) When making lemonade from a mix the powder is the ___________ while the water is the ____________. Solute Solvent Solute = what gets dissolved Solvent = what does the dissolving (almost always water)

  14. Agenda • Catalyst • Molecular movement • Diffusion vs. Osmosis • Practice Objective: SWBAT • Predict the direction of water movement across a membrane

  15. Diffusion- particles move from high concentration to low concentration until they are equal Both solute & solvent move in diffusion

  16. Diffusion of perfume in air Classroom Particles diffuse throughout the room

  17. Diffusion of glucose in a animal cell (glucose = solute ) Cells External Environment Glucose will diffuse out of the cell Cells Internal Environment

  18. Osmosis • Osmosis is a type of diffusion. • WATER is the particle that moves in osmosis. ONLY SOLVENT MOVES • Water moves to equal out the CONCENTRATION of SOLUTE Water moves into the cell

  19. Osmosis • The movement will continue until the concentration of SOLUTE is EQUAL Cells Internal Environment 25% glucose 75% water Cells External Environment 25% glucose 75% water

  20. Osmosis of a cell in salt water Cells External Environment Cells Internal Environment 65% NaCl 35% H2O 25% NaCl 75% H2O Water will leave the cell to go wherever there is more solute

  21. Diffusion vs. Osmosis

  22. Diffusion worksheet will get TURNED IN AT THE END OF CLASS and graded for ACCURACY • The LEFT side deals with DIFFUSION • The RIGHT side deals with OSMOSIS • Complete all 16 questions (8 on each side)

  23. Tomorrow you will submerge a egg into a 20%, 40%,60%, 80% and 100% solution of corn syrup, as well as pure water. • Predict what will happen to the mass of each egg in each solution. (6 sentences) • Ex: The egg in the water will gain mass because….. • Note: start with the pure water and 100% corn syrup predictions. You should be able to figure those out…

  24. Catalyst: SILENTLY answer the 7 pre-lab questions on the front of your lab sheet Agenda Pre-lab questions Data table Lab Procedures and set up Objective Conduct a controlled experiment to determine how the amount of solute effects the amount of osmosis.

  25. In your lab groups… • LABEL the cups • Group initials or group number • Type of solution going in the cup • Initial Mass of the egg in the cup (filled in later) • Prepare your three solutions using the BEAKERS and pour them into their corresponding labeled cup. LOOK AT YOUR GROUPS SIGN FOR YOUR ASSIGNED SOLUTIONS • Get three eggs for your group. • Record the initial mass for each egg both on the data table AND on the cup it goes in. • Place your eggs in the back of the room as directed.

  26. Catalyst: (Top of pg. 51) What is the difference between a dependent and independent variable in an experiment. (Talk to a partner, come up with a collective answer)

  27. Agenda Catalyst Notebook organization Pre-lab questions Final mass measurements and Lab Clean-up Class data table Objective: SWBAT Conduct a controlled experiment to determine how different solutions effect the rate of osmosis

  28. What page are we on? • pg. 46 – Molecular Movement notes & or Quotes • pg. 47 –Diffusion and Osmosis notes • pg. 48-Diffusion and Osmosis notes & lab predictions • pg. 49- Egg-speriment Lab Data table • Pg. 50- Egg- speriment Lab sheet pg. 1 • Pg. 51- Egg- Speriment Lab sheet pg. 2

  29. With you lab group… • Carefully go to the back and collect your cup. DO NOT DISTURB OTHER EXPERIMENTS! • GENTLY remove the egg from the cup and rinse it off under running water. x3 • Record the final mass of your eggs on your data table. • Carefully place the eggs in the trash can. DO NOT POP THEM! • Clean the cups with soap and water and remove the tape • Stack clean cups in the back by the sinks

  30. Graph Set up… • PG. 52 • This will be a BAR GRAPH • Y-axis= dependent variable & X-axis = Independent variable • Y-axis = Mass of the egg (grams) • X-axis = Different solutions • y-axis number intervals? 5, 10, 15? • ALWAYS START AT 0….NO EXCEPTIONS…..EVER • You will have 2 bars for each solution one bar for initial mass and one bar for final mass

  31. Red blood cells in 3 solutions

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