Question

The complex concerned with oxidative phosphorylation in the inner mitochondrial membrane is:

• A. Complex IV
• B. Complex V
• C. Complex III
• D. Complex II

Answer 1

The correct option is B Complex V

Oxidative phosphorylation is the process in which ATP is formed as a result of the transfer of electrons from NADH or FADH${}_2$ to $O_2$ by a series of electron carriers. This process, which takes place in mitochondria, is the major source of ATP in aerobic organisms. The metabolic pathway through which the electron passes from one carrier to another, is called the electron transport system (ETS) and it is present in the inner mitochondrial membrane. When the electrons pass from one carrier to another via complex I to IV in the electron transport chain, they are coupled to ATP synthase (complex V) for the production of ATP from ADP and inorganic phosphate.