BIOL 151 Study Guide - Cell Membrane, Exocytosis, Phototropin

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orchidwildebeest887

21 Jan 2014

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***osmosis- type of diffusion; water across a membrane. Non-penetrating solutes, so only water can move. Hypertonic: - higher concentration of ions in solution than in cell. The solution is hypertonic to the cell . Hypotonic: - lower concentration of ions in solution than in cell. The solution is hypotonic to the cell . Isotonic: - no net change in movement. Molecules are moving against the conc. gradient. 3 na+ from inside bond to pump : atp adp + pi (where the energy to change pump shape comes from, the pump shape is changed. 3 na+ move out, 2 k+ move bond to pump, pi falls off: pump shape is changed back to original, 2 k+ move out. The sodium potassium pump creates an electrochemical gradient. Proton pump: active transport of h + across membrane. Guard cells: kidney bean shape due to the way microfilaments are lined. Purpose: guard opening of stomatol pore & co2 in, h2o out.

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

A hypertonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

A hypotonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

The salt and water solution in the potato is a hypotonic solution

Osmosis is the movement of large molecules across a membrane which require embedded proteins

The plain water in this experiment is the solvent and the salt is the solute.

Passive transport requires no energy and the molecules move with the concentration gradient or from high concentration to low concentration

Active transport required no energy and the molecules move with the concentration gradient or from high concentration to low concentration.

The water on the inside of the potato with the salt molecules is an isotonic solution the same as the solution on the outside of the potato.

Water will not move by simple diffusion (osmosis) into or out of cells it requires energy or protein transporters

The solution of salt water in the potato has a lower concentration of water molecules so the water on the outside should move into the cells

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 151 Study Guide - Cell Membrane, Exocytosis, Phototropin

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