home >> biology >> definition In biochemistry , flavin adenine dinucleotide ( FAD ) is the precursor molecule to FADH2 . fad diet Popular nutrition Any of a number of weight-reduction diets that either eliminate one or more of the essential food groups, or recommend consumption of one type of food in excess at the expense of other foods; FDs rarely follow modern principles for losing weight. flavin adenine dinucleotide (FAD) a coenzyme that is a condensation product of riboflavin phosphate and adenylic acid; it forms the prosthetic group (non–amino acid component) of certain enzymes, including d-amino acid oxidase and xanthine oxidase, and is important in electron transport in mitochondria. What does FAD stand for? Fat is a term used to describe a class of macro nutrients used in metabolism called triglycerides. When FAD reacts with two hydrogen atoms, it can form FADH2. Define fad. fad′dism n. fad′dist n. Fad - definition of fad by The Free Dictionary. FAD also exists in two redox states. Flavin adenine dinucleotide is considered a redox cofactor that is related to many metabolic reactions. See more. flavin adenine dinucleotide n. A fashion that is taken up with great enthusiasm for a brief period of time; a craze. Flavin adenine dinucleotide (FAD) is a cofactor for cytochrome-b 5 reductase, the enzyme that maintains hemoglobin in its functional reduced state, and for glutathione reductase, an enzyme that also protects erythrocytes from oxidative damage. Upon bonding to two hydrogen atoms, FAD is reduced to FADH2 and is turned into an energy-carrying molecule. Fat Definition. Open any biology textbook and you’ll learn about NAD+, which stands for nicotinamide adenine dinucleotide. It’s a critical coenzyme found in every cell in your body that’s involved in hundreds of metabolic processes like cellular energy and mitochondrial health. It stands for flavin adenine dinucleotide. abbr. These make up one of three classes of macronutrients including proteins and carbohydrates. fad synonyms, fad pronunciation, fad translation, English dictionary definition of fad. One of the main differences that can be seen between FAD, flavin adenine dinucleotide, and NAD, nicotinamide adenine dinucleotide, is in the difference of accepting hydrogen atoms. Like NAD, FAD can temporarily store energy during cellular respiration via a reduction reaction. FAD and FADH2 FAD is a second electron carrier used by a cell during cellular respiration. FAD acts as an electron carrier in energy metabolism. FADH2 This is produced in the Krebs cycle and is a reduced form of FAD, it is an electron carrier capable of creating 2 ATP from releasing its electrons to the electron transport chain. 1 FADH2 (x 2 ATP) = 2 ATP 1 NADH (x 3 ATP) = 3 ATP Biology Glossary search by EverythingBio.com Coenzyme sythesized from riboflavin. 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