Question

Oxidative Phosphorylation

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

Answer 1

The correct option is C

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

The correct option is C:

Explanation for Correct option:

1. The process of ATP creation being linked to the flow of electrons via the mitochondrial electron transport chain and the consumption of oxygen is known as oxidative phosphorylation.

Explanation for Incorrect options:
Option A:

1. The Kreb's cycle produces 24–28 ATP molecules from one molecule of glucose transformed to pyruvate by oxidative phosphorylation.
2. There is no oxidation of phosphate group in oxidative phosphorylation

Option B;

1. There is no transfer of phosphate group in oxidative phosphorylation.
2. This is characteristic of substrate-level phosphorylation.

Option D:

1. A phosphate group is taken from one of the pathway's intermediate reactants, and the reaction's free energy is used to add the third phosphate to an accessible ADP molecule, yielding ATP.
2. Substrate-level phosphorylation is a very direct technique of phosphorylation.

Final answer: Oxidative Phosphorylation: Formation of ATP by energy released from electrons removed during substrate oxidation.