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Transcript
Name: __________________________ Foundations of Biology Pd _______ Date______________ Mr. Thompson Passive Transport Webquest Diffusion thru Membrane http://www.indiana.edu/~phys215/lecture/lecnotes/diff.html (Click on Diffusion with Arrows) 1. At the beginning of the animation, how many particles are on each side of the membrane? A. Left side has _____________ B. Right side has ____________ 2. The particles are moving in both directions, however more molecules from the left side are moving to the ___________ side. 3. Watch the animation for 2 minutes, or until it reaches NO NET FLOW. How many particles are on each side of the membrane? 4. When there is NO NET FLOW, the cell is said to reach what? 5. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration without the use of __________________. Osmosis effects on the cell http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm 6. Cell membranes are semi-permeable. What does this mean? Are cell membranes permeable to water? 7. The word “solute” has been used several times in this website. What do you think the term “solute” means or refers to? 8. Press Play for Hypertonic: What happens to the cell in a hypertonic solution? Why? Why does water move this way? 9. Press Play for Hypotonic: What happens to the cell in a hypotonic solution? Why? Why does water move this way? 10. Press Play for Isotonic: What happens to the cell in an isotonic solution? Why? Why does water move this way? http://programs.northlandcollege.edu/biology/Biology1111/animations/transport1.html PART ONE: Choose PASSIVE TRANSPORT FIRST 11. Define PASSIVE TRANSPORT : 12. List the three types of passive transport: 1. 2. 3. 13. The cell membrane consists of several parts which include: 1. ___________ - may act as channels 2. Fluid _________ bilayer 14. Diffusion is the movement of molecules from an area of ______ concentration to an area of _________ concentration. 15. Diffusion is said to move ______________ the concentration gradient. 16. There are 4 factors that influence the rate of diffusion. 1. The concentration gradient (The differences between molecules in a given space) 2. The charge of the molecule 3. The size of the molecule 4. ______________________________ 16. Diffusion ends when equilibrium is reached. What does equilibrium mean? 17. Define facilitated diffusion: 18. Does facilitated diffusion take energy for the cell? _________ 19. Does facilitated diffusion move down the concentration gradient? ___________ 20. What helps the molecules move into and out of the cell during facilitated diffusion? ___________________________________________ 21. Osmosis is the diffusion of _______________ across a cell membrane. 22. Hypertonic solutions have a ________________ amount of dissolved solute and therefore less pure water. 23. Water tends to move towards the _________________ environment because the solute levels are higher but the water concentration is lower. 24. Hypotonic solutions have _________________dissolved solutes but a higher concentration of pure water. 25. Isotonic solutions have ____________ amounts of solute inside and outside the cell.