Which of the following can contribute to the membrane potential of a plant cell?

Question

Which of the following can contribute to the membrane potential of a plant cell? Cations moving out of a cell down a concentration gradient Negatively charged macromolecules (proteins, nucleic acids) being held inside the cell P-type ATPases pumping protons out of the cell at the expense of ATP All of the above None of the above If we measure the membrane potential and the concentration of a solute on either side of a membrane, the Nemst equation will tell us if passive or energized transport is employed tell us the reduction/oxidation (redox) status of the cell differentiate between primary and secondary active transport tell us which direction water will move provide prudent investment strategies for retirement.

Explanation / Answer

3) Nernst equation will let us know the potential of an ion of charge z across a membrane. This is calculated by using the ion concentration on both side of the membrane( Inside and outside the cell). So It will tell us about the reduction or oxidation status of cell. It relates to the reduction potential of electrochemical reaction.

2) The p type ATPases in plants contribute to the membrane potential. They pump protons. Other p type ATPases include Na+/K+ pump , Ca+2 pump

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