Cell Transport and Plasma Membrane Structure

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1 Cell Transport and Plasma Membrane Structure POGIL Guided Inquiry Learning Targets Explain the importance of the plasma membrane. Compare and contrast different types of passive transport. Explain how materials diffuse across a semipermeable membrane. Predict the effect of osmotic solutions on plant and animal cells. Identify examples of passive and active transport. Contrast active and passive transport. MEMBRANE STRUCTURE & FUNCTION How do substances move in and out of cells? Advertisements for sports drinks, such as Gatorade, PowerAde, and Vitaminwater, etc. seem to be everywhere. All of these drinks are supposed to help your body recover and replenish lost electrolytes, fluids, and vitamins after exercise. But how do the essential molecules contained in these drinks get into your cells quickly to help you recover after exercise? 1. How many different types of molecules are shown in model 1? 2. Count and record the number of triangles and circles found on each side of the membrane.

2 3. Which shape is larger? 4. Describe the direction of the movement of the molecules in model Which molecules are able to pass through the semi permeable membrane? Justify your answer. 6. If you left this system for an extended period of time and then viewed it again, would you expect to find any changes in the concentrations of the molecules on either side of the membrane? Justify your answer. 7. What two major types of biological molecules compose the majority of the cell membrane in model 2? 8. How many different protein molecules are found in model 2?

3 9. What is the difference between the position of the surface proteins and the membrane spanning proteins? 10. When a carbohydrate chain is attached to a protein, what is the structure called? 11. When a carbohydrate is attached to a phospholipid, what is the structure called? 12. What types of molecules are shown moving across the membrane? 13. Where exactly in the membrane do these molecules pass through? 14. How does the concentration of the small molecules inside the cell compare to that outside the cell? 15. Because particles move randomly, molecules tend to move across the membrane in both directions. Does the model indicate that the molecules are moving in equal amounts in both directions? Justify your answer using complete sentences. READ THIS! When there is a difference in concentration of a particular particle on either side of a membrane, a concentration gradient exists. Particles move along the concentration gradient from high to low concentration until a state of equilibrium is reached. At that point, there is no more net movement in one direction, although the particles continue to move randomly across the membrane, often called dynamic equilibrium. The net movement of particles along the concentration gradient is called diffusion. 16. Look back at models 1 and 2. Which particles are moving by diffusion across the membranes shown?

4 17. Using all the information from the previous models and questions, circle the correct response to correctly fill in each blank. a. Diffusion is the net movement of molecules from an area of (low/high) concentration to an area of (low/high) concentration. b. The molecules will continue to move along this (semi permeable membrane/concentration gradient) until they reach (diffusion/equilibrium). c. Once equilibrium is reached, molecules will continue to move across a membrane (randomly/in one direction) 18. Which part of the cell membrane is shown in more detail in model 3? 19. What type of molecules attach the protein? 20. Explain in detail what happened that allowed the glucose molecule to pass through. READ THIS! Some molecules, such as glucose, use gated channels as shown in Model 3; however, not all channels are gated. Some channels remain permanently open and are used to transport ions and water across the cell

5 membrane. 21. To facilitate means to help. Explain why this type of of diffusion is called facilitated diffusion. 22. The tails of phospholipids are nonpolar; therefore, they do not readily interact with charged particles such as ions. How can this explain why facilitated diffusion is necessary for the transfer of ions such as Na + and K + across the cell membrane? 24. Which part of the cell membrane is shown in more detail in model 4? Look back at model 2 if needed. 25. What shape represents the substance being transported across the membrane in model In which direction is the transported substance moving from an area of high concentration to an area of low concentration or from an area of low concentration to an area of high concentration? Support your answer.

6 27. Is the substance being moved along (down) a concentration gradient? Justify your answer. 28. ATP is a type of molecule that can provide energy for biological processes. Explain how the energy is being used in model What happens to the ATP after it binds to the protein? 30. The type of transport shown in model 4 is called active transport, while diffusion and facilitated diffusion are called passive transport. Given the direction of the concentration gradient in active and passive transport examples, explain why active transport requires energy input by the cell. 31. Complete the table below to show the difference between active and passive transport. 32. Formulate a definition for active transport.

7 EXTENSION QUESTIONS 33. Given the information in the graph, which type of cell transport would be best to move substances into or out of the cell quickly? Justify your answer. 34. Which type of transport would be best if the cell needs to respond to a sudden concentration gradient difference? Explain. 35. Why would the line representing facilitated diffusion level off as the concentration gets higher, while the line representing diffusion continues to go up at a steady rate? TRANSPORT IN CELLS How do water molecules move in and out of cells? Water accounts for over 70% of the human body. If water levels are not regulated and maintained in an organism the consequences can be disastrous. Cells and tissues may swell, blood cells burst, or the brain may expand so much it pushes on the skull, leading to brain damage and death. So what exactly is the process that allows organisms to regulate and maintain their water content?

8 1. A solution consists of a solute and a solvent mixed together. For the solution in model 1 identify and provide the symbol : a. solute. b. solvent. 2. Consider the size of the sugar and water molecules in model 1. Which molecules in the diagram in model 1 are able to move through the selectively permeable membrane? 3. Consider the arrows indicating movement across the membrane. a. In which direction are water molecules moving into or out of the cell? b. Are more water molecules moving into or out of the cell? c. Is the net direction of water movement into or out of the cell? 4. Circle the correct word below to indicate the change in the concentration of the sugar solution on each side of the membrane as water molecules move. a. The solution inside the cell will become (more/less) concentrated with the net movement of water. b. The solution outside the cell will become (more/less) concentrated with the net movement of water. 5. Applying what you already know about the random movement of molecules, what will eventually happen to the concentration on both sides of the membrane?

9 6. The definition of diffusion is the movement of molecules across a membrane from an area of high concentration to an area of low concentration. According to this definition, is the cell in model 1 undergoing diffusion? Explain. 7. In the cell diagram in model 1, where is the higher concentration of water inside or outside of the cell? 8. Is the cell in model 1 undergoing diffusion if you consider the concentration of water on either side of the selectively permeable membrane? Explain. READ THIS! Osmosis is the movement of water from high water concentration to low water concentration across a semi permeable membrane.

10 9. Using your knowledge of cells, which type of cells in model 2 animal or plant have a. a selectively permeable membrane? b. a permeable, rigid cell wall? 10. The arrows in model 2 show movement of water into and out of the cells. What does the thickness of the arrow indicate? 11. For each question use diagrams A F in model 2. Which cells show a. a net increase in water? b. a net decrease in water? c. no net change in water? 12. Consider the definition for osmosis and the net movement of water from a dilute solution (high concentration of water) to a concentrated solution (low concentration of water). a. Describe the concentration of the solution surrounding cells A and D (extracellular), relative to the concentration of the solution inside cells A and D (intracellular). b. Describe the concentration of the extracellular solution of cells C and F, relative to the intracellular solution of cells C and F. c. Describe the concentration of the extracellular solution of cells B and E, relative to the concentration of the intracellular solution of cells B and E. 13. Using the diagrams in Model 2 and the answers to the previous question, develop definitions for the following words. a. A hypertonic extracellular solution is. b. A hypotonic extracellular solution is. c. An isotonic extracellular solution is. 14. Consider the cells in Model 2 that are in hypertonic solutions. a. Describe what has happened to the plant cell.

11 b. What word is used to summarize these changes to the plant cell? c. What word would be used if the cell were from an animal? 15. Consider the cells in Model 2 that are in hypotonic solutions. a. Describe the changes to the plant cell. b. What word summarizes these changes to the plant cell? c. What word would be used if the cell were from an animal? 16. When animal cells are in a hypotonic solution they can undergo lysis. However, plant cells do not, they only become turgid. a. Define lysis based on the diagram in Model 2. b. What structure on the plant cell prevents lysis from occurring in a hypotonic solution?

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