BIOL 1000 Lecture Notes - Lecture 15: Facilitated Diffusion, Passive Transport, Cell Membrane

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pucemole333

9 Nov 2018

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Passive transport; diffusion of substance across the membrane with no energy investment other space may be directional. Diffusion is the tendency for molecules to spread out evenly into the available. Although each molecule moves randomly, diffusion of a population of molecule. At dynamic equilibrium, molecules cross the membrane in one direction as the. Substances diffuse across their concentration gradient, from area of high. The diffusion of substances across a biological membrane is passive transport. Osmosis is the diffusion of free water across a selectively permeable membrane. Tonicity, is the ability of a surrounding solution to cause a cell to gain or lose. Isotonic solution, solute concentration is the same inside the cell; no net water. Hypertonic solution, solute concentration is greater than that inside the cell, cell. Hypotonic solution, solute concentration is less than that the inside of the cell; Osmoregulation, the control of solute concentrations and water balance, is a.

Related Questions

Match each term

1.facilitated diffusion 2. Hypertonic solution
3. Hypotonic solution
4. Active Transport
5. Secondary acive transport
6. Simple Diffusion

A.	The transport of a nonpolar molar across a biological membrane from the compartment with a high concentration to one with low concentration.
B.	A process that utilizes energy to move compounds against a concentration gradient, i.e., from the compartment with lower concentration to one with a higher concentration.
C.	a solution that would cause blood cells to swell and burst
D.	a solution that would cause red blood cells to shrink
E.	The transport of a hydrophilic molecule across a biological membrane using an ion gradient created by an electrogenic pump.
F.	A process by which compounds are transported from a region of high concentration to one of lower concentration using membrane proteins as transporters.

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

11. Synthesis of ATP using the energy released as a proton diffuses down a concentration gradient involves the conversion of concentration gradient energy into chemical energyâTrue or false?

12. In the absence of active transport of a molecule, a simple or facilitated diffusion of the molecule will result in an equilibrium of the molecule across the membraneâTrue or false?

13. In the absence of an active transport of a molecule, a simple or facilitated diffusion of the molecule across a membrane will result in zero energy available to do workâTrue or false?

14. If biological membranes were permeable to all solutes osmosis could not occur because the concentration of water will be same on both sides of the membraneâTrue or false?

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BIOL 1000 Lecture Notes - Lecture 15: Facilitated Diffusion, Passive Transport, Cell Membrane

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