6. What is the value of AG for the inward movement of glucose through a facilitated diffusion channel if the extracellular concentration of glucose is 5 mM and the intracellular concentration of glucose is 1 mM at 25°C?

6. What is the value of AG for the inward movement of glucose through a facilitated diffusion channel if the extracellular concentration of glucose is 5 mM and the intracellular concentration of glucose is 1 mM at 25°C?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter5: Structure And Function Of Plasma Membranes

Section: Chapter Questions

Problem 8RQ: Water moves via osmosis. throughout the cytoplasm from an area with a high concentration of other...

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Concept explainers

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

Question

6. What is the value of AG for the inward movement of glucose through a facilitated diffusion channel if the
extracellular concentration of glucose is 5 mM and the intracellular concentration of glucose is 1 mM at
25°C?

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A characteristic of carrier molecules in a primary active transport pump is that: a. they cannot transport a substance and also hydrolyze ATP. b. they retain their same shape as they perform different roles. c. their primary role is to move negatively charged ions across membrances. d. they move Na+ into a neural cell and K+ out of the same cell. e. they act to establish an electrochemical gradient.
8. Which of the following ion transport functions must be carried out by a pump? a. transport of Na+ from the extracellular space to the cytosol b. transport of glucose from the extracellular space to the cytosol c. transport of K+ from the cytosol to the extracellular space d. transport of Na+ from the cytosol to the nucleus e. transport of Na+ from the cytosol to the extracellular space.
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