MAKE CONNECTIONS Aquaporins exclude passage ofhydronium ions (H3O+), but some aquaporins allow passage of glycerol, a three-carbon alcohol (see Figure 5.9),as well as H2O. Since H3O+is closer in size to water thanglycerol is, yet cannot pass through, what might be thebasis of this selectivity?

MAKE CONNECTIONS Aquaporins exclude passage ofhydronium ions (H3O+), but some aquaporins allow passage of glycerol, a three-carbon alcohol (see Figure 5.9),as well as H2O. Since H3O+is closer in size to water thanglycerol is, yet cannot pass through, what might be thebasis of this selectivity?

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter2: Atoms And Molecules: The Chemical Basis Of Life

Section: Chapter Questions

Problem 15TYU

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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

MAKE CONNECTIONS Aquaporins exclude passage of
hydronium ions (H3O+
), but some aquaporins allow passage of glycerol, a three-carbon alcohol (see Figure 5.9),
as well as H2O. Since H3O+
is closer in size to water than
glycerol is, yet cannot pass through, what might be the
basis of this selectivity?

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