Question

a respiring bacterial cell experienced a change such that the external ph and internal ph across its cell membrane had the same value of 6.5 and the net charge difference across the membrane was 0 millivolts. which statement below among a - d is false concerning the state of this cell? atp formation by this cell would be negatively affected in a big way. the proton motive force would be zero. there would be no electrochemical potential available for cellular work. the δψ value would be affected by this change, but not the δph value (equation: δp = δψ - 60δph) none of a - d is false; all are true.

Explanation:

The proton - motive force ($\Delta p$) is related to the electrical potential ($\Delta\psi$) and the pH difference ($\Delta pH$) by the equation $\Delta p=\Delta\psi - 60\Delta pH$. When the net charge difference across the membrane is 0 and there is a change in external and internal pH, the $\Delta\psi$ value would be affected by this change. Also, since $\Delta p$ is related to $\Delta\psi$ and $\Delta pH$, ATP formation (which depends on $\Delta p$) would be negatively affected. The proton - motive force cannot be zero under these conditions as there is a pH change. And the change in conditions will affect the electro - chemical potential available for cellular work.

Answer:

None of A - D is false; all are true.