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CELL ENVIRONMENTS REVIEW SHEET NAME ___________________________ 1. What is diffusion? 2. Name three examples of diffusion. 3. Molecules move from a ___________________ concentration to a ___________________ concentration in order to reach a balanced state called _________________________ 4. What is osmosis? Explain and be specific. 5. What is the difference between diffusion and osmosis? Provide an example for each. 6. TRUE OR FALSE: When making popcorn, the “scent molecules” are highly concentrated inside the package while being popped. When you open the package and release the molecules, hat would be an example of osmosis. Explain whether this statement is true or false and WHY. 7. The movement of water from a greater to lesser concentration through a semi-permeable membrane is an example of what? 8. Define “semi-permeable”. Define “permeable”. Define “impermeable”. Directions: Label each statement with either “ISOTONIC” “HYPOTONIC” OR “HYPERTONIC” for questions #9-11. 9. If there is more water on the outside of the cell than inside, we would say that it is…. 10. If there is 92% water inside the cell and 92% water outside the cell, then it would be considered…. 11. There is an equal distribution of water inside as there is outside of the cell…. Directions: In each problem, the questions are as follows: a. Where is there more water? b. Which way does the water go? c. What tonic? d. What are the results in regular words (take note if it is a PLANT or an ANIMAL cell) e. The result in large vocab words (plasmolysis, plasmoptysis, turgid, flaccid) 12. 65% H2O 13. 92.5% H2O 14. 98% H2O 15. 15% salt 16. 25% sugar a. 85% H2O . b. c. d. e. a. b. 92.5% c. H2O d. e. a. b. 10% c. salt d. e. a. b. 95% H2O c. d. e. a. b. 15% c. salt d. e. 17. Define the word “homeostasis”. 18. Give three examples of homeostasis: a. b. c. 19. Use the diagram from your notes to label the cell membrane: QuickTime™ and a decompressor are needed to see this picture. 20. What are the functions of the cell membrane? Name two. a. b. 21. What is a “phospholipid bilayer”? 22. Which part of a phospholipid mixes with water? 23. Which part of a phospholipid does not mix with water? 24. Define “hydrophilic”. (use online activity 6.2) 25. Define “hydrophobic”. (use online activity 6.2) 26. What is “facilitated diffusion” and what molecules need to use it? 27. 28. 29. 30. 31. Does diffusion use energy from the cell? Does osmosis use energy from the cell? Does facilitated transport use energy from the cell? Does active transport use energy from the cell? Define active transport and why does a cell need to do this? 32. List the two TYPES of active transport discussed in class. E______________________________ E______________________________ 33. Which type of active transport moves materials into the cell? 34. Which type of active transport pushes materials out of the cell? 35. In active transport, molecules go from an area of _______________ concentration to an area of ____________ concentration, which is ____________ the “concentration gradient”. 34. In passive transport (diffusion, osmosis, facil. diffusion), molecules go from an area of _______________ concentration to an area of ________________ concentration, which is _____________ the “concentration gradient”. 35. When we did the plastic bags experiment with the starch, which molecule/s could move across the plastic bag and WHY?