ࡱ> c !bjbj >؎؎<Dl(lll$Ѝj͋lVlll͋@@c=)m)m)ml@)ml)m)mR12Cl:%0(C)m<>ODll)mlllll͋͋)mlll(lllllllllllll> :  Name: _________________________ Date: _____________ Diffusion and Osmosis 1. Look at these pictures of a cell surrounded by oxygen molecules. The small dots are oxygen molecules. Circle the picture that correctly shows where oxygen molecules should appear after diffusion has taken place. Before       After  A. B. C.     What is diffusion? ________________________________________________________________ __________________________________________________________________________________ How do molecules get through the cell membrane? _______________________________________ ____________________________________________________________________________________ 4. What is osmosis? ___________________________________________________________________ ____________________________________________________________________________________ 5. Which way would the water molecules move in the following: cucumber slice in salt water__________________________________________________ salt is poured on a snail _____________________________________________________ vegetables are sprinkled with water ____________________________________________ Osmosis is the diffusion of water from an area of high concentration to an area of low concentration. Only water moves in osmosis! The diagrams below show the concentration of water and salt inside the cell and the concentration of water and salt surrounding the cell. Complete the sentences below by comparing the concentration of the water inside the cell and the concentration outside the cell.          5.0% (m/v) glucose or 0.9% (m/v) NaCl is used medically because each has a solute concentration equal to the osmotic pressure equal to red blood cells Indicate if each of the following solutions is 1) isotonic 2) hypotonic 3) hypertonic ____ 2% (m/v) NaCl solution ____ 1% (m/v) glucose solution ____ 0.5% (m/v) NaCl solution ____ 5% (m/v) glucose solution Compare/Contrast: Simple diffusion/facilitated diffusion- Active vs. passive transport- Active transport and facilitated diffusion Diffusion and Osmosis-Key 1. Look at these pictures of a cell surrounded by oxygen molecules. The small dots are oxygen molecules. Circle the picture that correctly shows where oxygen molecules should appear after diffusion has taken place. Before       After  A. B. C.     What is diffusion? _the movement of molecules by random motion from areas of high concentration to areas of low concentration. How do molecules get through the cell membrane? Through diffusion, facilitated diffusion or active transport. 4. What is osmosis? The movement of water through a semi-permeable membrane from areas of high concentration to low concentration. ____________________________________________________________________________________ Which way would the water molecules move in the following: cucumber slice in salt water out of the cucumber and into the salt water salt is poured on a snail out of the snail vegetables are sprinkled with water into the vegetables Osmosis is the diffusion of water from an area of high concentration to an area of low concentration. Only water moves in osmosis! The diagrams below show the concentration of water and salt inside the cell and the concentration of water and salt surrounding the cell. Complete the sentences below by comparing the concentration of the water inside the cell and the concentration outside the cell.            5.0% (m/v) glucose or 0.9% (m/v) NaCl is used medically because each has a solute concentration equal to the osmotic pressure equal to red blood cells Indicate if each of the following solutions is 1) isotonic 2) hypotonic 3) hypertonic __3__ 2% (m/v) NaCl solution ___2_ 1% (m/v) glucose solution ___2_ 0.5% (m/v) NaCl solution __1__ 5% (m/v) glucose solution Compare/Contrast: Simple diffusion/facilitated diffusion- They are both passive transports that move particles from high to low concentration, but facilitated diffusion must use a channel protein whereas simple diffusion just occurs across the membrane directly. Active vs. passive transport- Active transport requires energy. It includes using a carrier protein to move particles from low to high concentration across a membrane. Passive transport does NOT require energy and flows from high to low concentration. It includes Simple Diffusion and Facilitated Diffusion. Active transport and facilitated diffusion They both involve proteins, but facilitated diffusion just flows from high to low concentration through a channel protein without needing any energy. Active transport uses a carrier protein and energy to carry particles from low to high concentration. a. Water will flow _____________________ (into the cell, out of the cell, in both directions). b. The cell will ______________________ (shrink, burst, stay the same). 95% NaCl 5% H2O 5% NaCl 95% H2O a. Water will flow _____________________ (into the cell, out of the cell, in both directions). b. The cell will ______________________ (shrink, burst, stay the same). 5% NaCl 95% H2O 5% NaCl 95% H2O a. Water will flow _____________________ (into the cell, out of the cell, in both directions). b. The cell will ______________________ (shrink, burst, stay the same). 5% NaCl 95% H2O 95% NaCl 5% H2O a. Water will flow _____________________ (into the cell, out of the cell, in both directions). b. The cell will ______________________ (shrink, burst, stay the same). 95% NaCl 5% H2O 5% NaCl 95% H2O a. Water will flow _____________________ (into the cell, out of the cell, in both directions). b. The cell will ______________________ (shrink, burst, stay the same). 5% NaCl 95% H2O 5% NaCl 95% H2O a. Water will flow _____________________ (into the cell, out of the cell, in both directions). b. 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