welveR.mexd 8S inU Active and passive transport Scenarios Scenario 1 alor The diagram to the right shows iodine molecules, which are small enough to pass through a semi permeable membrane. A. Illustrate which way the molecules will move. B. What type of transport is this? Explain.
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- Determine the type of transport. Here are your options:Simple diffusion, facilitated diffusion, osmosis, primary activetransport, secondary active transport1. A hydrophobic molecule is moving through the membrane2. K+ moving against its gradient (low to high) through the sodiumpotassium pump3. Water moving through the cell membrane4. A solute moving down its gradient through a carrier proteinDescribe the two types of passive transport. Explain what kind of proteins are required for each type of passive transport and highlight the similarities and differences of these proteins.1. Name the two forms of passive transport. 2. With reference to a named, specific example, describe the processes involved in channel mediated diffusion. In your answe state what kind of transport it is. 3. Explain why the graph obtained for facilitated diffusion when velocity of transport of a given molecule is plotted against its concentration is a hyperbola. In your answer, highlight the events that occur along the hyperbola.
- Item11 Item 11 The sodium-potassium ATPase functions by performing Multiple Choice a. primary active transport. b. secondary active transport. c. exocytosis. d. both exocytosis and endocytosis. e. receptor-mediated endocytosis. Item12 Item 12 The uptake of cholesterol into cells is an example of Multiple Choice a. phagocytosis. b. pinocytosis. c. receptor-mediated endocytosis. d. receptor-mediated exocytosis. e. simple diffusion. Item13 Item 13 The sodium-potassium pump moves Multiple Choice a. sodium and potassium into the cell. b. sodium and potassium out of the cell. c. sodium into the cell and potassium out of the cell. d. sodium out of the cell and potassium into the cell.rate of transport Vmax 1/2Vmax transporter-mecated diffusion Km simple diffusion concentration of transported molecule The graph at left shows rates of movement across a cell membrane for a substance that uses simple diffusion (green) and a transport mechanism (red). Which of the following is TRUE about the transporters at the point shown by the arrow? A. The transporter proteins are operating more slowly than at lower concentrations. B. The transporter proteins are operating as fast as possible. C. The transporters proteins shut off at that concentration. D. The rate slows because transporter proteins run out of ATP.. Diatomic oxygen (O2) exhibits which of the following membrane transport movements? A. it is not able to cross the membrane by passive transport, because it is big, polar, and inorganic it is not able to cross the membrane by active transport, because it is big, polar, and inorganic it is able to cross the membrane by facilitated diffusion, because it is small, polar, and organic it is able to cross the membrane by active transport, because it is big, nonpolar, and organic it is able cross the membrane by simple diffusion, because it is small, nonpolar, and inorganic
- Match the transport mechanisms with their descriptions. (1) diffusion (2) facilitated diffusion (3) filtration (4) active transport (5) endocytosis (6) exocytosis A. the cell membrane engulfs a particle or substance, drawing it into the cell in a vesicleB. movement down the concentration gradient with a carrier protein, without energy inputC. movement down the concentration gradient without a carrier protein or energy inputD. a particle or substance leaves a cell in a vesicle that merges with the cell membraneE. movement against the concentration gradient with energy inputF. hydrostatic pressure forces substances through membranes8. Define homeostasis. maintoining nterral balance 9. What role does the cell membrane play in maintaining homeostasis? 10. How is facilitated diffusion different from diffusion? How are they similar? 11. List two ways that active transport is different than passive transport. 1) 2) 12. Why is the sodium-potassium pump considered an active transport? Which direction are the sodium and potassium bing pumped? How many sodiums are being pumped? How many potassiums are being pumped?O O 8:12 r cdn.fbsbx.com Receptor-mediated endocytosis A specific receptor protein on the plasma membrane recognizes an extracellular molecule and binds with it. a. Describe the net movement of water by drawing arrows on the diagram. (3 points each) b. Tell whether the solutions are isotonic, hypertonic or hypotonic. Label each picture. (3 points each) c. What kind of transport is shown in the diagram above? Is it active or passive transport? Explain why? (10 points) d. What will happen to cells "A", "B" and "C" after a period of time has passed? (3 points each) 60% water 40% salt The reaction stimulates the membrane to indent and create a vesicle containing the selected molecule. 40% water 60% salt SEAT WORK 40% water LTE 70% water 30% salt 80% water 20% salt Done 70% water 30% salt 70% water 30% salt 9
- Understanding membranes: a) Describe the factors that influence fatty acid melting temperatures and how these are taken advantage of by many organisms to modulate membrane fluidity. Why would an organism have the need to regulate membrane fluidity? b) Explain the difference between a symporter and an antiporter and discuss the energetics of transport/movement in each caseQualitative thinking: For diffusion, we need to keep straight the difference between diffusion rate and diffusive flux. a. How do diffusive flux and diffusion rate differ? How do their units differ? b. Give an equation that relates the two. c. Based on Fick's equation for diffusive flux, what are some conditions that would increase flux and rate?Which statements are true? Explain why or why not.1 Transport by transporters can be either active orpassive, whereas transport by channels is always passive.2 Transporters saturate at high concentrations ofthe transported molecule when all their binding sites areoccupied; channels, on the other hand, do not bind theions they transport and thus the flux of ions through achannel does not saturate.3 The membrane potential arises from movementsof charge that leave ion concentrations practically unaf-fected, causing only a very slight discrepancy in the num-ber of positive and negative ions on the two sides of themembrane.