BIOL 101 Study Guide - Midterm Guide: Facilitated Diffusion, Membrane Transport Protein, Passive Transport

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blackcaribou209

15 Dec 2016

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What is diffusion: in the absence of other forces, a substrate will diffuse from where it is more concentrated to where it is less concentrated until it is equally distributed. What is osmosis: passive transport of water, water moves hypotonic to hypertonic solution when solute cannot cross membrane, attempts to dilute solute to equal concentration. Be able to do problems (like the ones we did in class & maybe a little harder) predict which way water will flow. What are the two types of proteins that do facilitated diffusion (5. 15 and text): occurs with help of transport proteins in the cell membrane. What is needed in active transport (5. 15 and text): active pumping of substances across membrane, moves up concentration gradient, requires energy (atp, usually accomplished by carrier proteins. Understand the workings of the sodium/potassium pump (see fig. 5. 14: moves na+ ions, creating the concentration gradient. 3 na+ & 1 atp bind to the pump .

Related Questions

Read the following scenarios and indicate which of the following processes they describe.

11. Sodium molecules move randomly around a solution of sodium chloride in water, frequently colliding with other sodium ions and chloride ions. secondary active transport diffusion osmosis facilitated diffusion primary active transport

12. Sodium ions (Na+) move through sodium channels in a synthetic membrane. primary active transport secondary active transport facilitated diffusion osmosis

13. Water molecules move into the cytosol of a cell placed in a hypotonic solution. primary active transport secondary active transport facilitated diffusion osmosis

14. Water molecules move into the cytosol of a cell placed in pure water. facilitated diffusion osmosis secondary active transport primary active transport

15. Water molecules move out of a cell placed in a hypertonic solution. facilitated diffusion primary active transport secondary active transport osmosis

16. The action of sodium-potassium pumps moves sodium ions (Na+) out of a cell and potassium ions (K+) into a cell. facilitated diffusion secondary active transport osmosis primary active transport

17. Glucose molecules move into cells lining the intestine against their concentration gradient driven by the movement of sodium ions (Na+) into the cells down their concentration gradient. osmosis secondary active transport primary active transport facilitated diffusion

18. A beaker of water is separated by a selectively permeable membrane that allows the passage of water but not ions. A solution of 4% sodium chloride (NaCl) is placed on one side of the membrane and pure water is placed on the other side of the membrane. The solutions are allowed to equilibrate. At this point, which process is going on? facilitated diffusion osmosis secondary active transport primary active transport

amaranthelk944

1. predict the direction of water movement based on differences in solute concentrations. Use the terms osmotic pressure, hypotonic, isotonic, and hypertonic
2. Why do membranes have to be selectively permeable?

3. What determines whether a particular substance can diffuse (simple or facilitated) through a membrane?

4. What mechanisms drive molecules across membranes? Use the terms concentration gradient, (facilitated) diffusion and active transport.
5. Which parts of the plasma membrane proteins do you expect to be hydrophobic or hydrophilic? Justify your answer.
concise and short answers pls

1. What are the structural and functional units of a living organism? 2. What is the role of the cell membrane? 3. What is the cell membrane made of? 4. What does phospholipid bi-layer mean? 5. What are some functions of membrane proteins? 6. What are the two major groups of cell membrane proteins? How are they different? 7. Describe diffusion. 8. What does selectively permeable mean? 9. Does diffusion require energy from the cell? 10. What might restrict the movement of a molecule across a cell membrane? 11. In the video what are channel proteins are compared to? 12. What does gated channel mean? 13. Explain osmosis. 14. Explain isotonic. 15. Explain hypotonic. 16. Explain lysis of a cell. 17. Explain hypertonic. 18. How is facilitated diffusion different than regular diffusion? 19. Define active transport. 20. What does the sodium / potassium pump do for the cell?

BIOL 101 Study Guide - Midterm Guide: Facilitated Diffusion, Membrane Transport Protein, Passive Transport

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