Catalyzes quinol oxidation with the concomitant reduction of oxygen to water. Major component for energy conversion during vegetative growth. Subunit II transfers the electrons from a quinol to the binuclear center of the catalytic subunit I (By similarity). 2 a quinol + O2 = 2 a quinone + 2 H2O Interacts with FloT. Present in detergent-resistant membrane (DRM) fractions that may be equivalent to eukaryotic membrane rafts; these rafts include proteins involved in signaling, molecule trafficking and protein secretion. Belongs to the cytochrome c oxidase subunit 2 family. Extended N-terminus.