Why does an electrochemical potential build up in mitochondria,but not in chloroplasts?
A)Proton movement into the thylakoid lumen is compensated for (neutralized)by the movement of other ions.
B)Proton movement into the intercristal space is compensated for (neutralized)by the movement of other ions.
C)Proton movement into the cristae lumen is compensated for (neutralized)by the movement of other ions.
D)The protons in chloroplasts are immediately joined to electrons.
E)The protons in mitochondria are immediately joined to electrons.

Question

Quizplus · Accepted Answer

In chloroplasts, proton movement into the thylakoid lumen is compensated for by the movement of other ions, such as magnesium and chloride. This prevents an electrochemical potential from building up. In contrast, in mitochondria, protons are pumped into the intermembrane space and there is no compensating movement of other ions. As a result, an electrochemical potential builds up across the inner mitochondrial membrane.

Why Does an Electrochemical Potential Build Up in Mitochondria,but Not