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5 Written questions

5 Matching questions

  1. What irreversible reaction drives the synthesis of UDP-glucose?
  2. What is glycogenin?
  3. What is the overall reaction of glycogen phosphorylase activity?
  4. What enzymes are involved in Glycogen degradation?
  5. What are the properties of branching?
  1. a PPi+ H2O=> 2Pi
  2. b Utilizes a non branched string of at least 11 glycosyl residues long. Branching enzyme transfers a string of typically 7 residues from non reducing end to presumptive branch point.
  3. c Glycogen (n residues) + Pi=> glucose-1-phosphate + Glycogen (n-1 residues)
  4. d 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
  5. e Glycogen phosphorylase, Transferase, alpha 1,6 glucosidase, phosphoglucomutase

5 Multiple choice questions

  1. Glycogen synthase catalyzes transfer of glucose from UDP-glucose to a growing chain
  2. 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
  3. A very large, branched polymer of glucose residues. Most of the glucose residues are linked by alpha 1,4 glycosidic bonds. branches about every 10th residue are linked by alpha 1,6 glycosidic bonds
  4. When glucose residues are removed to the "limit dextran" which is the 4th glucose residue from the branch glucose
  5. The 4th glucose residue from the branch glucose

5 True/False questions

  1. What does transferase do?Transferase transfers the 3 terminal glucose residues from outer branch to the center, main linear branch

          

  2. Why is branching important in glycogen synthesis?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

          

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

          

  4. What is phosphoglucomutase?A very large, branched polymer of glucose residues. Most of the glucose residues are linked by alpha 1,4 glycosidic bonds. branches about every 10th residue are linked by alpha 1,6 glycosidic bonds

          

  5. What is Uridine Diphosphate?Phosphoglucomutase is a phospho enzyme and converts Glucose 1 phosphate to glucose 6 phosphate for further metabolism

          

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