You have prepared lipid vesicles (spherical lipid bilayers) that contain Na + -K
ID: 202407 • Letter: Y
Question
You have prepared lipid vesicles (spherical lipid bilayers) that contain Na+-K+ pumps as the sole membrane protein.
All of the Na+-K+ pumps are oriented in such a way that the portion of the molecule that normally faces the cytosol is on the inside of the vesicle and the portion of the molecule that normally faces the extracellular space is on the outside of the vesicle.
Assume that each pump transports one Na+ ion in one direction and one K+ ion in the other direction during each pumping cycle. Consult the figure (which was also presented in lecture.)Figure is not needed to answer the question.
What will happen under the following conditions?
The solutions inside and outside the vesicles contain both Na+ and K+ ions but no ATP.
Na+ will be pumped out of vesicle
Na+ will be pumped into the vesicles
K+ will be pumped out of vesicles.
K+ will be pumped into the vesicles
Both Na+ and K+ will be pumped out of vesicles.
Both Na+ and K+ will be pumped into the vesicles.
Neither Na+ nor K+ will be pumped in any direction.
You have prepared lipid vesicles (spherical lipid bilayers) that contain Na+-K+ pumps as the sole membrane protein.
All of the Na+-K+ pumps are oriented in such a way that the portion of the molecule that normally faces the cytosol is on the inside of the vesicle and the portion of the molecule that normally faces the extracellular space is on the outside of the vesicle.
Assume that each pump transports one Na+ ion in one direction and one K+ ion in the other direction during each pumping cycle. Consult the figure (which was also presented in lecture.)Figure is not needed to answer the question.
What will happen under the following conditions?
The solutions inside and outside the vesicles contain both Na+ and K+ ions but no ATP.
Explanation / Answer
Answer: Neither Na+ nor K+ will be pumped in any direction in the absence of ATP.
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