Cytochrome which hands over electrons to oxygen during terminal oxidation is

Which enzyme hands over electrons to oxygen during oxidative phosphorylation ?

The last or terminal cytochrome in respiratory chain is or In an electron transport chain in terminal oxidation the cytochrome which donates electrons to O_(2) is

The number of electrons required to reduce one molecule of oxygen to water during mitochondrial oxidation is

Terminal cytochrome of respiratory chain which donates electrons to oxygen is

Terminal cytochrome of respiratory chain which donates electrons to oxygen is

Terminal cytochrome of respiratory chain which donates electrons to oxygen is