NEETBotanyRespiration in Plants
What role does cytochrome c play in the electron transport chain?
Options
- AIt oxidizes NADH
- BIt acts as a mobile carrier for transfer of electrons between complex III and IV
- CIt receives electrons from FADH2
- DIt transfers electrons to ubiquinone
Correct answer
B. It acts as a mobile carrier for transfer of electrons between complex III and IV
Step-by-step solution
Electrons from NADH produced in the mitochondrial matrix during citric acid cycle are oxidized by an NADH dehydrogenase (complex I), and electrons are then transferred to ubiquinone located within the inner membrane. Ubiquinone also receives reducing equivalents via FADH2 (complex II) that is generated during oxidation of succinate in the citric acid cycle. The reduced ubiquinone (ubiquinol) is then oxidized with the transfer of electrons to cytochrome c via cytochrome bc 1 complex (complex III). Cytochrome c is a