In the preceding section, you saw how
chemiosmosis works in one type of prokaryotic cell.
As you'll see in this topic, the same components, electron
transport chain and ATP synthase, are found in mitochondria
and chloroplasts. And as in the prokaryotic example,
chemiosmosis in both organelles involves harvesting
energy from redox reactions, storing the energy in a
proton gradient, and producing ATP.
You might consider the functions of these organelles
the reverse of one another - after all, the mitochondrion
degrades nutrient molecules, while the chloroplast synthesizes
them. But the process of chemiosmosis involved in each
is similar. You'll see that differences in the arrangement
of components and energy inputs/outputs lead to different
outcomes of chemiosmosis in the two organelles.