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.
The name N-formylmethionine refers to the position of fMet at the N-terminus of the polypeptide. niche See: ecological niche. nicotinamide adenine dinucleotide (NAD) A coenzyme electron carrier that occurs in two states, an oxidized form (NADâº) and a reduced one (NADH). In metabolism, NAD is active in redox reactions. As NADâº it accepts electrons and becomes reduced (NADH), then, as NADH, it acts as a reducing agent, donating electrons.