Dictionary Definition

Flavin-adenine dinucleotide can be defined as a coenzyme associated with a variety of proteins which are involved with various enzymatic reactions in metabolism. Some of its functions include the metabolism of sugars, fats, and proteins. Flavin-adenine dinucleotide also functions as an electron carrier in oxidation and reduction reactions. 

Molecular Structure of Flavin-adenine dinucleotide 
Flavin adenine dinucleotide (FAD) | Endogenous Metabolite | MedChemExpress

Coenzyme Q is a small lipid-soluble molecule that carries electrons between protein complexes in the mitochondrial electron transport chain. Coenzyme Q is found in plants, animals, and different types of bacteria; its function consists of conjunction with enzymes in cellular respiration. Coenzyme Q can also be referred to as ubiquinone. 

Molecular Structure of Coenzyme Q

The Krebs Cycle is the final pathway of oxidation of glucose, fats, and amino acids. The Krebs cycle is a chain of reactions that occur in the mitochondria, through which almost all living cells produce energy in aerobic respiration. This cycle uses oxygen and gives out water and carbon dioxide; the Kreb cycle provides electrons and hydrogen required for the electron chain transport. The Krebs Cycle can also be referred to as the Citric Acid Cycle. 



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