<prompt> In glycogen metabolism, a metabolically active impoant enzyme found in liver is conveed from its inactive dephosphorylated state to its active phosphorylated state. Which of the following is true about this enzyme:Phosphorylation sometimes activates the enzymeCatecholamines directly stimulate itMore commonly seen in fasting state than in fed stateAlways activated by cAMP dependent protein kinase  <response>: The enzyme in concern in this question is Glycogen Phosphorylase: Glycogen Phosphorylase RLE of glycogenolysis Active in phosphorylated state. Phosphorylation always activates this enzyme. option A is wrong Catecholamines stimulate this enzyme through cAMP, not directly. option B is wrong Glycogenolysis is occurring in fasting state, not in fed state. CAMP activates this enzyme but Calcium calmodulin directly activates this enzyme without phosphorylation and without cAMP. option D is wrong as this enzyme is not always activated by cAMP. 