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How does the K+ channel accomplish removal of the water from the shell around the ion?

How does the K+ channel accomplish removal of the water from the shell around the ion? Carbonyl groups lining the wall of the pore can interact with the unsolvated K+ ion, balancing the energy needed to remove the hydration shell.

What does a hydration shell do?

When there are many water molecules relative to solute molecules, as in an aqueous solution, these interactions lead to the formation of a three-dimensional sphere of water molecules, or hydration shell, around the solute. Hydration shells allow particles to be dispersed (spread out) evenly in water.

What is typically true of ion channels?

What is typically true of ion channels? They are gated. An ion channel undergoes conformational changes with each ion it passes.

Why would a cell express the aquaporin protein if water can cross the membrane in the absence of aquaporin?

Why would a cell express the aquaporin protein if water can cross the membrane in the absence of aquaporin? Aquaporin facilitates the faster movement of water molecules across the membrane.

What type of transport are aquaporins?

The classical aquaporins transport solute-free water across cell membranes; they appear to be exclusive water channels and do not permeate membranes to ions or other small molecules….Patterns of Aquaporin Expression.

Major Sites of Expression Comments
Aquaporin-1 Kidney: proximal tubule Concentration of urine

Is osmosis An example of facilitated diffusion?

Osmosis is basically diffusion with water. The most common example of facilitated diffusion is the movement of water across a cell membrane through transmembrane proteins, which requires no energy. They are simply powered by the concentration differences of the molecules between the two sides of the cell membrane.

What is a property of carrier mediated facilitated diffusion that distinguishes it from simple diffusion?

The three characteristics of facilitated diffusion that differ from simple diffusion is that facilitateddiffusion is powered by the random movement of molecules (no ATP used), Requires specific carrier-mediated proteins, and transport proteins may always exist in the plasma membrane or be insertedwhen needed.