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5 Written questions

5 Matching questions

  1. What is Uridine Diphosphate?
  2. What is the limit dextran?
  3. What role does UDP-glucose play in Glycogen synthesis?
  4. What is glycogen?
  5. Why is branching important in glycogen synthesis?
  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 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. d The 4th glucose residue from the branch glucose
  5. e Uridine diphosphate is a nucleotide composed of uracil, ribose and pyrophosphate

5 Multiple choice questions

  1. 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
  2. Glycogen synthase catalyzes transfer of glucose from UDP-glucose to a growing chain
  3. Glucose-1-phosphate +UTP =>UDP-glucose + PPi
  4. PPi+ H2O=> 2Pi
  5. UDP-glucose is synthesized from Uridine triphosphate and glucose-1-phosphate via the enzyme UDP-glucose pyrophosphorylase

5 True/False questions

  1. What are the properties of branching?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.

          

  2. What does transferase do?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

          

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

          

  4. What is debranching?When glucose residues are removed to the "limit dextran" which is the 4th glucose residue from the branch glucose

          

  5. What is phosphoglucomutase?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