Question

The oxidative phosphorylation is

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

Answer 1

The correct option is B

Formation of ATP by energy released from electrons removed during substrate oxidation

The correct option is B.

Explanation of correct option:

1. The final step in cellular respiration is oxidative phosphorylation.
2. It takes place in the mitochondria.
3. The process of oxidative phosphorylation is associated with a process called the electron transport chain.
4. The electron transport system is situated in the inner mitochondrial membrane.
5. The transferring of electrons takes place from one member of the transport chain to another via an array of redox reactions.
6. The process of the formation of ATP as a consequence of electron transfer from NADH or FADH₂ to oxygen, which is the final electron acceptor with the assistance of electron carriers is oxidative phosphorylation.

Final answer: Oxidative phosphorylation is the formation of ATP by energy discharged from electrons withdrawn at the time of substrate oxidation.