Which of the following electron carriers is required for both oxidative phosphorylation and photophosphorylation?

The correct answer is: Cytochrome

• As a consequence of photosynthesis, oxygen is created when sunlight drives water splitting at PSII during light reactions.
• In the mitochondrial electron transport chain, oxygen serves as the final electron acceptor and is subsequently reduced to water.
• During the dark phase of photosynthesis, carbon dioxide is fixed into carbohydrates utilizing the energy of ATP and NADPH. The proteins known as cytochromes have heme prosthetic groups and exhibit a distinctively high level of visible light absorption.
• Cytochromes a, b, and c are found in mitochondria as parts of complex III and complex IV. Ubiquinone gives an electron to cytochromes, which then transfer it to oxygen.
• The photolysis of water at PSII stimulates its reaction center, which then passes the electron to the cytochrome b6 f complex, which is found throughout the thylakoid membrane.