you have prepared lipid vesicles (spherical lipid bilayers) that contain Na the

Question

you have prepared lipid vesicles (spherical lipid bilayers) that contain Na the sole membrane protein. Assume that each pump transports one Na in one direction (from inside to outside the vesiele) and one K in the other during each pumping cycle. Also assume that the Na K pump functions as it does in the plasma membrane. Predict what would happen in each of the following conditions: consider the following of the Na^ + -K pump and be specific in your response: The solution outsaid contain K the solution insaid contains K and ATP. The solution insaid and vesicles and extra credit Describe the mechanism that causes the bending . rether then simply sliding of the fiagellum

Explanation / Answer

The Na-K+ pump is actually an ATPase. It uses energy from ATP while transport. One sodium will move outside the channel, and one K+ will move inside. Both transports will be against concentration gradient. In this process, one ATP will be expended, and will be converted to ADP.

Now, in case A) above concentrations of potassium inside and outside have not been given. Assuming concentrations of K+ same on both sides, transport will not occur. If concentration of potassium is more inside and less outside, then the pump will be active and transport of potassium will occur using energy from ATP.

In Case B) ATP is absent. so, no transport will occur.

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