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B
Cytochromes
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C
O2
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D
CO2
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Solution
The correct option is D Cytochromes The most important method of ATP synthesis is phosphorylation of ADP using inorganic phosphate and energy difference across membranes. The energy difference is provided by the electrochemical gradient of protons. When the energy of light is used to derive the electrochemical gradient of protons across the thylakoid membranes the process of ATP synthesis is called as photophosphorylation. When the energy obtained by oxidation of reduced coenzymes is used to establish electrochemical gradient of protons across the inner mitochondrial membrane the process of ATP synthesis is called as oxidative phosphorylation. During both photo and oxidative phosphorylation electrons are exchanged between iron containing cytochrome proteins.