Which of the following events at the electron-transport chain occurs last?

A) Hydrogen ions diffuse into inner mitochondrial compartment.
B) Hydrogen ions are moved from inner to outer mitochondrial compartment.
C) The movement of hydrogen ions through special channels is coupled to ATP production.
D) A hydrogen ion concentration gradient is established.
E) NADH transfer electrons to the electron-transport chain.

Electron-Transport Chain

A series of electron carriers located in the mitochondrial membrane, involved in the production of ATP through the process of oxidative phosphorylation.

Hydrogen Ions

Positively charged ions (H+) that play essential roles in the chemistry of water, pH balance, and metabolic processes.

Inner Mitochondrial Compartment

The matrix within mitochondria where critical reactions in cellular respiration, including the Krebs cycle, take place.