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Transcript
Diffusion/Osmosis/Homeostasis Label the different types of diffusion below _________________________ __________________ ________________________________ _____________________ The diagram shows many proteins and other molecules embedded in a cell membrane. 1. What is the function of the cell membrane? 2. What are some of the functions of these proteins and other molecules? 3. What is the cell membrane made of? 4. Match the term with its correct description: a. energy b. facilitated diffusion c. endocytosis d. passive transport e. active transport f. exocytosis g. carrier protein h. channel protein ________ Transport protein that provides a tube-like opening in the plasma membrane through which particles can diffuse ________ Is used during active transport but not passive transport ________ Process by which a cell takes in material by forming a vacuole around it ________ Particle movement from an area of higher concentration to an area of lower concentration ________ Process by which a cell expels wastes from a vacuole ________ A form of passive transport that uses transport proteins ________ Particle movement from an area of lower concentration to an area of higher concentration ________ Transport protein that changes shape when a particle binds with it 5. Match the term with its correct description: a. transport protein b. active transport c. diffusion d. passive transport e. osmosis f. endocytosis g. exocytosis h. equilibrium _____ The diffusion of water through a cell membrane _____ The movement of substances through the cell membrane without the use of cellular energy _____ Used to help substances enter or exit the cell membrane _____ When energy is required to move materials through a cell membrane _____ When the molecules of one substance are spread evenly throughout another substance to become balanced _____ A vacuole membrane fuses (becomes a part of) the cell membrane and the contents are released _____ The cell membrane forms around another substance, for example, how the amoeba gets its food _____ When molecules move from areas of high concentration to areas of low concentration 6. Complete the table by checking the correct column for each statement: Statement Causes a cell to swell Doesn’t change the shape of a cell Causes osmosis Causes a cell to shrink Isotonic solution Hypotonic solution Hypertonic solution Explain what has happened in the diagram to the left. 7. Why did the large dark molecules NOT move to the left? 8. How is the semi-permeable membrane like a cell membrane? 9. If the dark molecule is starch, where is the starch concentration greatest (left or right)? 10. If the white molecule is water, where is the water concentration greatest at first? 11. In osmosis, water moves from an area of __________ to an area of _________ concentration. (higher/lower) 12. If the dark molecules could move, in what direction would they move? Why? 13. In diffusion, molecules move from an area of ________ to an area of ________ concentration. (higher/lower) 14. What is osmotic pressure? 15. Which way water will move in each of the following situations: a. Salt inside the cell 65% and outside the cell 40%. ___________________________________ b. Sugar inside the cell 27% and outside 80%. ___________________________________ 16. What is homeostasis? 24. Comparison of active and passive transport PASSIVE TRANPORT ACTIVE TRANSPORT