Plant cells have a vacuole membrane-associated H+ ATPase that pumps protons out of the cytosol and...
Plant cells have a vacuole membrane-associated H+ ATPase that pumps protons out of the cytosol and into the lumen of the vacuole in order to acidify this organelle. What would you expect be the net effect of this pump on the resting membrane potential across the PLASMA MEMBRANE (charge in the cytosol) in plant cells?
A. The membrane potential is not affected by H+ transport.
B. The membrane potential would become more positive.
C. The membrane potential would become more negative.
D. The membrane potential is not affected by ion transport in other organelles.
Homework Answers
The membrane potential of cell is generated because of the unequal distribution of ions between the extracellualr side and intracellular side of a cell. It is not affected by the intercellular compartmental transport of ions because the overall intracellular ionic concentration remains unchanged. So, in case of vacuole, the transport of H+ ions will make no change in membrane potential as transport of ions to other organelles does not affect membrane potential. Hence, option D is correct.
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