Bio2 Pre-Activity: Passive and Active Transport Name: ______________________ Section: ____ LIGHTS, CAMERA, ACTIVE (& PASSIVE) TRANSPORT! • • Watch videos posted with PA6, read pre-lecture slides and Raven 5.1-5.4 to help you complete PA6. Please find your questions early, and come to Office Hours / tutoring to work on it together. 1. Fill out this chart comparing different mechanisms of transport across a plasma membrane: Simple Diffusion Facilitated Diffusion Primary Active Transport Secondary Active Transport Which types of molecules can cross membranes via each of these 4 mechanisms? (List the size, polarity, & charge of the cargo molecules) Requires a carrier or channel protein? (Yes/No; if yes, Channel, Carrier, or Either one?) Requires an energy source? (Yes/No; if yes, does the process directly use ATP?) Do any molecules travel against their concentration gradients or electrochemical gradients? (Yes/No; if yes, how many types of cargo move against their gradient -- 1 or 2?) 2. What is meant by the term “membrane potential”? And what is an electrochemical gradient? 3. What type of membrane protein does the cell use to generate a membrane potential? 4. Briefly describe the 6 steps involved in ion transport using the Na +/K+ pump. (can fit on 1 line, typed.) 1) 2) 3) 4) 5) 6) 5. Why would a cell die if its Na+/K+ pump were defective? 6. What is a cotransporter? 7. Why are electrochemical gradients important to the process of co-transport? 8. Is the Na+/K+ pump considered a cotransporter (Yes/No)? ______ Why or why not? Passive and Active Transport 1. Name: ______________________ Section: ____ Fill out this chart comparing different mechanisms of transport across a plasma membrane: Simple Diffusion Facilitated Diffusion Primary Active Transport Secondary Active Transport Which types of molecules can cross membranes via each of these 4 mechanisms? (List the size, polarity, & charge of the cargo molecules) Requires a carrier or channel protein? (Yes/No; if yes, Channel, Carrier, or Either one?) Requires an energy source? (Yes/No; if yes, does the process directly use ATP?) Do any molecules travel against their concentration gradients or electrochemical gradients? (Yes/No; if yes, how many types of cargo move against their gradient -- 1 or 2?) 2. What is meant by the term “membrane potential”? And what is an electrochemical gradient? 3. What type of membrane protein does the cell use to generate a membrane potential? 4. Briefly describe the 6 steps involved in ion transport using the Na +/K+ pump. (can fit on 1 line, typed.) 1) 2) 3) 4) 5) 6) 5. Why would a cell die if its Na+/K+ pump were defective? 6. What is a cotransporter? 7. Why are electrochemical gradients important to the process of co-transport? 8. Is the Na+/K+ pump considered a cotransporter (Yes/No)? ______ Why or why not? 
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