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5 Written questions

5 Matching questions

  1. What role does UDP-glucose play in Glycogen synthesis?
  2. What are the properties of branching?
  3. Why is branching important in glycogen synthesis?
  4. What is glycogenin?
  5. What irreversible reaction drives the synthesis of UDP-glucose?
  1. a Increases the number of terminal glucose residues which are site of action for glycogen phosphorylase and synthase. Branching increases rate of glycogen synthesis and degradation
  2. b Glycogen synthesis involves transfer of glucose from UDP-glucose to a growing chain
  3. c 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.
  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 PPi+ H2O=> 2Pi

5 Multiple choice questions

  1. Glucose 6 phosphatase converts Glucose 6 phosphate into glucose for export out of the liver and transport to other tissues
  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. Glycogen synthase catalyzes transfer of glucose from UDP-glucose to a growing chain
  4. The 4th glucose residue from the branch glucose
  5. Phosphoglucomutase is a phospho enzyme and converts Glucose 1 phosphate to glucose 6 phosphate for further metabolism

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. What enzymes are involved in Glycogen degradation?Glycogen phosphorylase, Transferase, alpha 1,6 glucosidase, phosphoglucomutase

          

  3. What are the properties of the presumptive branch point?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.

          

  4. What is the overall reaction of glycogen phosphorylase activity?Glucose-1-phosphate +UTP =>UDP-glucose + PPi

          

  5. What is debranching?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

          

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