<prompt> Which one of the following coenzyme is associated with glycogen phosphorylase?Thiamine pyrophosphateTetrahydrofolateFlavin mononuleotidePyridoxal phosphate  <response>: Glycogen phosphorylase has a pyridoxal phosphate PLP, derived from Vitamin B6 at each catalytic site. Pyridoxal phosphate links with basic residues and covalently forms a Schiff base. Once the Schiff base linkage is formed, holding the PLP molecule in the active site, the phosphate group on the PLP readily donates a proton to an inorganic phosphate molecule, allowing the inorganic phosphate to in turn be deprotonated by the oxygen forming the a-1,4 glycosidic linkage. 