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.
Nicotinamide Adenine Dinucleotide (NAD) is a dinucleotide that functions as one of the most important coenzymes in the cell. The interconversion of NAD between the reduced (NADH) and oxidized (NAD+) forms is a common reaction in biological redox (oxidation-reduction) reactions.In cells, most oxidations are accomplished by the removal of hydrogen atoms. Each molecule of NAD + can acquire two electrons; that is, be reduced by two electrons.he oxidizing agent is NAD+, which is reduced to NADH. The process is exergonic and the mechanism that has evolved allows the energy of reaction to be captured as two moles of ATP per glucose molecule: 2 NAD +. 2.