Question

Where does oxidative phosphorylation occur in a eukaryotic cell?

• A. Mitochondrial matrix
• B. Inner mitochondrial membrane
• C. Outer mitochondrial membrane
• D. Cytosol
• E. Stroma

Answer 1

The correct option is B Inner mitochondrial membrane

Oxidative phosphorylation is the production of ATP with the help of energy liberated during oxidation of reduced coenzymes and terminal oxidation. The final step of aerobic respiration is the oxidation of 10 molecules of NADH + H⁺ and 2 molecules of FADH₂ which are generated from a molecule of glucose. These are oxidized in presence of oxygen through respiration chain. In this step, oxygen from the atmosphere is used for the oxidation of reduced co-enzymes and it is called as terminal oxidation and this is also associated with ATP synthesis. So it is called oxidative phosphorylation. It is an oxidative process that occurs on the inner membrane of the mitochondrion in an eukaryotic cell.

So, the correct answer is Inner mitochondrial membrane.