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Plasma Membrane Quiz

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1. How many phospholipid bi-layers surround the mitochondria (describe)




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2. If a graph of the gradient vs the rate of a molecule to cross a membrane reaches a point where increasing the gradient no longer increases the rate of crossing, what does this signify?




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3. What is facilitated transport?




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4. What is active transport?




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5. What is endocytosis?




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6. How can the rate of a molecules diffusion into the cell be measured?




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7. What is phagocytosis?




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8. What does it mean when something "moves along it's gradient"?




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9. Does Active Transport require energy and why or why not?




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10. Summarize the process of phagocytosis.




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11. Highly charged or very big particles (unless they are aided by something that spans the membrane such as a receptor protein)




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12. Small uncharged particles




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13. A phospholipid bi-layer with proteins embedded throughout




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14. An extrinsic protein or a peripheral protein




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15. To increase the gradient means to increase the difference in concentrations on both sides of the membrane




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16. Active Transport and Facilitated Transport




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17. Facilitated transport refers to the assisting of a molecule to cross a membrane along it's gradient while active transport refers to the assisting of a molecule to cross a membrane against it's gradient




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18. Exocytosis is when the plasma membrane invaginates and breaks off in a fashion that allows things to exit the cell ("cytosis" can be remembered as "cell eating")




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19. The Fluid Mosaic Model (referring to the fact that the phospholipids move about freely along the membrane in a fluid like fashion and the proteins are fixed with limited mobility, creating an intuitive image similar to a mosaic)




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20. Diffusion or facilitated transport





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