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5 Written questions

5 Matching questions

  1. What are the properties of the presumptive branch point?
  2. What enzymes are involved in Glycogen degradation?
  3. What is Uridine Diphosphate?
  4. What is the overall reaction of UDP glucose formation?
  5. What is glycogenin?
  1. a Must be at least 4 residues away from other branches. Links are alpha 1,6 glycosidic bond
  2. b Glycogen phosphorylase, Transferase, alpha 1,6 glucosidase, phosphoglucomutase
  3. c Glycogenin is both an enzyme and its substrate consisting of two 37 kD subunits. Each subunit catalyzes addition of a glycosyl unit from UDP glucose to Tyr 194 of other subunit. Subsequently, 7 more glycosyl units are added so that 8 glycosyl units are attached to Tyr 194 for each subunit
  4. d Glucose-1-phosphate +UTP =>UDP-glucose + PPi
  5. e Uridine diphosphate is a nucleotide composed of uracil, ribose and pyrophosphate

5 Multiple choice questions

  1. When glucose residues are removed to the "limit dextran" which is the 4th glucose residue from the branch glucose
  2. Transferase transfers the 3 terminal glucose residues from outer branch to the center, main linear branch
  3. A glycosyl unit from UDP glucose is transferred to the hydroxyl group at the C4 of the terminal glucose residue forming a alpha 1,4 glycosidic bond. Requires a glycogen molecule that is a minimum of 4 residues to which a glycosyl will be added
  4. Glucose 6 phosphatase converts Glucose 6 phosphate into glucose for export out of the liver and transport to other tissues
  5. The 4th glucose residue from the branch glucose

5 True/False questions

  1. What does alpha 1,6 glucosidase do?Alpha 1,6 glucosiase hydrolyzes the alpha 1,6 glucosidic bond to release a free glucose molecule

          

  2. What is the overall reaction of glycogen phosphorylase activity?Glycogen (n residues) + Pi=> glucose-1-phosphate + Glycogen (n-1 residues)

          

  3. What irreversible reaction drives the synthesis of UDP-glucose?PPi+ H2O=> 2Pi

          

  4. What is phosphoglucomutase?Phosphoglucomutase is a phospho enzyme and converts Glucose 1 phosphate to glucose 6 phosphate for further metabolism

          

  5. What is glycogen?Glycogenin is both an enzyme and its substrate consisting of two 37 kD subunits. Each subunit catalyzes addition of a glycosyl unit from UDP glucose to Tyr 194 of other subunit. Subsequently, 7 more glycosyl units are added so that 8 glycosyl units are attached to Tyr 194 for each subunit