Without the activation barrier, glucose would combine spontaneously with oxygen. Cellular respiration does not oxidize glucose in one explosive step, as the energy could not be efficiently harnessed in a form available to perform cellular work. Enzymes lower the activation energy in cells, so glucose can be slowly oxidized in a stepwise fashion during glycolysis and Krebs cycle. A dinucleotide that functions as a coenzyme in the redox reactions of metabolism. Found in all cells.
Assists enzymes in electron transfer during redox reactions of metabolism.
Small nonprotein organic molecule that is required for certain enzymes to function. A molecule consisting of two nucleotides. Release the remaining proton into the surrounding solution.