Question

Oxidation of one molecule of $FAD{H}_2$ gives rise to ______ molecules of ATP.

• A. 2
• B. 3
• C. 8
• D. 24

Answer 1

The correct option is A 2

Oxidation of one molecule of $FAD{H}_2$ gives rise to 2 molecules of ATP.

During Krebs cycle, when succinate is oxidized to fumarate, 2 protons and 2 electrons are released. These are taken by $FA{D}^{+}$ and $FAD{H}_2$ is formed. This $FAD{H}_2$ undergoes oxidation and releases electrons which pass through the electron transport chain. The energy of these electrons is utilised to pump protons into the intermembrane space of mitochondria. This creates a proton gradient and helps to generate ATP.