Question

Oxidative phosphorylation is

• A. formation of ATP energy released from electrons removed during substrate oxidation
• B. formation of ATP by transfer of phosphate group from a substrate to ADP
• C. oxidation of phosphate group in ATP
• D. addition of phosphate group to ATP

Answer 1

The correct option is A formation of ATP energy released from electrons removed during substrate oxidation

Oxidative phosphorylation is the final step in aerobic cellular respiration in which there is synthesis of ATP.

During oxidative phosphorylation, NADH+H+and FADH2 get oxidized and release electrons. These electrons are transferred to oxygen by a series of electron carriers. The energy of these electrons is utilized to synthesize ATP.

The formation of ATP by transfer of a phosphate group from a substrate (energy-rich donor) to ADP is called substrate-level phosphorylation.

Hence, the correct answer is option A.