Exam 15: Principles of Metabolic Regulation

Order the steps leading to glycogen breakdown resulting from the stimulation of liver cells by glucagon. 1)Activation of protein kinase A (PKA) 2)cAMP levels rise 3)Phosphorylation of phosphorylase b 4)Phosphorylation of phosphorylase b kinase 5)Stimulation of adenyl cyclase

Why is it important for proper cell function that proteins turn over rather than persisting indefinitely after being synthesized?

Which one of the following directly results in the activation of glycogen synthase?

Show the reaction catalyzed by glycogen synthase.

Order the steps leading to glycogen synthesis resulting from the stimulation of liver cells by glucose. 1)Xyulose-5-phosphate is formed 2)Glucose is phosphorylated to glucose-6-phosphate 3)Glycogen synthase is dephosphorylated 4)Protein phosphatase 2A is activated

Which of the following is true of glycogen synthase?

In the glycolytic path from glucose to pyruvate,three steps are practically irreversible.What are these steps,and how is each bypassed in gluconeogenesis? What advantages does an organism gain from having separate pathways for anabolic and catabolic metabolism? What are the disadvantages?

Which of the following statements about gluconeogenesis in animal cells is true?