This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 8. What is facilitated diffusion? Is it active or passive? Why must some solutes cross membranes by facilitated diffusion rather than by simple diffusion (compare molecules that cross membranes via simple diffusion and facilitated diffusion)? 9. What is the difference between a carrier protein and a channel protein? Which type of transport protein would you expect to be used in facilitated diffusion? Active transport? 10. Why does the Na +-K + pump require energy and what is the energy source? 11. What are the two components of an electrochemical gradient? 12. What is cotransport? How does cotransport allow a substance to move against its gradient without the direct input of energy? 13. What is the major way by which receptor-mediated endocytosis and phagocytoisis differ? 14. How is material that enters a cell by phagocytosis eventually released into the cell? 2...
View Full Document
- Fall '08
- Proteins, concentration gradient