The three golden lions on a red background, symbolising England, occupy the first and fourth quarters. The Arms of Scotland, a red lion rearing on its hind legs inside a red border, are in the second quarter, and the Arms of Ireland's golden harp with silver strings on a blue background-are in the third quarter.
Once it is reduced to QH2, ubiquinone delivers its electrons to the next complex in the electron transport chain. Q receives the electrons derived from NADH from complex I and the electrons derived from FADH2 from complex II, including succinate dehydrogenase. This enzyme and FADH2 form a small complex that delivers electrons directly to the electron transport chain, bypassing the first complex.
FAD, an electron acceptor, gets electrons transferred to it, making a molecule of FADH2, another type of electron carrier. Finally, the new four-carbon compound gets converted to another four-carbon compound, and can restart the cycle after acetyl-CoA enters again. Another molecule of NADH is also produced. carrier protein help the hydrogen ions to diffuse back into the inner compartment. This carrier protein also produces ATP after a phosphate group is added to ADP. Hydrogen ions and electrons combine with oxygen molecules to form water molecules.