Physiology General physiology 994aff81 All are markers of mitochondria except A ATP synthase B 5-nucleotidase C Glutamate dehydrogenase D Creatine kinase High-Yield Explanation 5-nucleotidase is a marker in the mitochondria It cleaves 5 - nucleotides Ref:Guyton and Hall textbook of medical physiology 12th edition ,pag number: 20,21,22