3. You\'ve synthesized different sets of lipid vesicles, which are small, spheri

Question

3. You've synthesized different sets of lipid vesicles, which are small, spherical phospholipid- bilayer enclosed structures with an aqueous interior. A. (6pts) Vesicles in Set A contain no membrane proteins and no solutes in the inside (just water). You put these vesicles into a solution containing 4 types of molecules: ammonia (NH3), nitrogen gas (N2) RNA & sorbitol sugar (CeHOe). You measure the concentration df each of the solutes inside samples of vesicles over time, and the plot shows the results. Which curve corresponds to each molecule? iv B. (4pts) Vesicles in Set B contain the potassium (K) channel protein in their membranes. You can set the initial concentrations of K' ions inside and outside the vesicles. Under what initial conditions will you observe K+flow into the vesicles?

Explanation / Answer

Potassium channels transport potassium ions down the electrochemical gradient. Hence if we wish for the K+ flow into the vesicles we must set the initial potassium ion concentration to be higher in the surrounding solution. However, depending on the type of the channel you might also need to provide some other conditions. Like calcium's presence in Calcium-activated potassium channel and so on..

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