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Osmosis and Tonicity Define osmosis. _____________________________________ In which direction does water move across membranes, up or down the concentration gradient? ________________ Define these 3 terms: a. isotonic_____________________________________ b. hypertonic _____________________________________ c. hypotonic _____________________________________ Use arrows to show the direction of water movement into or out of each cell. Color and label the cell in an isotonic environment light blue, the hypotonic environment yellow, and the hypertonic environment light green. Match the description or picture with the osmotic condition: A. Isotonic B. Hypertonic C. Hypotonic _____ _____ same _____ _____ _____ _____ _____ _____ _____ solution with a lower solute concentration solution in which the solute concentration is the condition plant cells require condition that animal cells require red blood cell bursts (cytolysis) plant cell loses turgor pressure (Plasmolysis) solution with a higher solute concentration plant cell with good turgor pressure solution with a high water concentration Label the tonicity for each solution (isotonic, hypotonic, or hypertonic): ____________ ____________ ____________ ____________ ____________ _ ___________ Transport Requiring Energy (Active) What type of transport is represented by the following picture? _______________________ What energy is being used? ______________ In which direction (concentration gradient), is the movement occurring? _________________ Color the internal environment of the cell yellow. Color and Label the transport proteins red and the substance being moved blue. Active Transport 1. How is active transport different than simple diffusion and facilitated diffusion? __________________________________________________________________________________ 2. The prefix exo- means “out of” and the prefix endo- means “taking in”. How do these meanings relate to the meaning of exocytosis and endocytosis? __________________________________________________________________________________ __________________________________________________________________________________ 3. What process is shown in Figure A? _____________________________ What process is shown in Figure B? _____________________________ 4. Do you think that endocytosis and exocytosis can occur within the same cell? Explain your reasoning. __________________________________________________________________________________