Glycolysis Reaction 4 & 5
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Questions and Answers

In reaction 3 of glycogen synthesis, what type of bond is formed between glucose molecules and the end of a glycogen chain?

  • α (1 6) glycosidic bond
  • α (1 4) glycosidic bond (correct)
  • β (1 6) glycosidic bond
  • β (1 4) glycosidic bond

    • In glycogenolysis, what is the result of reaction 1?

  • Glucose molecules are released from the glycogen chain (correct)
  • Glucose molecules are converted to glycogen
  • Glucose molecules are dephosphorylated to yield free glucose
  • Glucose molecules are phosphorylated to yield glucose-6-phosphate

    • What is the purpose of the debranching enzyme in glycogenolysis?

  • To phosphorylate glucose molecules
  • To convert glucose-1-phosphate to glucose-6-phosphate
  • To break α (1 6) glycosidic bonds (correct)
  • To break α (1 4) glycosidic bonds

    • In reaction 3 of glycogenolysis, what is the outcome of the isomerization reaction?

    <p>Glucose-1-phosphate is converted to glucose-6-phosphate</p> Signup and view all the answers

    What is the final product of glycogenolysis in liver and kidney cells?

    <p>Free glucose</p> Signup and view all the answers

    In reaction 1 of glycogenolysis, what is the role of glycogen phosphorylase?

    <p>To phosphorylate glucose molecules</p> Signup and view all the answers

    What is the result of the oxidation and phosphorylation reaction in reaction 6?

    <p>Formation of two molecules of 1,3-bisphosphoglycerate</p> Signup and view all the answers

    What is the role of triose phosphate isomerase in reaction 5?

    <p>Isomerization of dihydroxyacetone phosphate</p> Signup and view all the answers

    What is the net result of reactions 4-6 in terms of energy generation?

    <p>Generation of 2 ATP molecules</p> Signup and view all the answers

    What is the purpose of the phosphorylation reaction in reaction 7?

    <p>To generate ATP molecules</p> Signup and view all the answers

    What is the result of the cleavage reaction in reaction 4?

    <p>Formation of two three-carbon phosphate isomers</p> Signup and view all the answers

    How many carbon atoms from glucose are contained in the two triose phosphates after reaction 5?

    <p>6 carbon atoms</p> Signup and view all the answers

    What is the type of glycosidic bonds between glucose molecules in glycogen?

    <p>α(1 4)-glycosidic bonds</p> Signup and view all the answers

    What is the byproduct of the reaction catalyzed by pyrophosphorylase in glycogenesis?

    <p>Pyrophosphate, PPi</p> Signup and view all the answers

    What happens when energy stores (glycogen) are full?

    <p>Additional glucose is converted to triacylglycerols and stored as body fat</p> Signup and view all the answers

    What is the first step in glycogen synthesis?

    <p>Isomerization of glucose-6-phosphate</p> Signup and view all the answers

    What is the energy source for the phosphorylation reaction in glycogenesis?

    <p>UTP</p> Signup and view all the answers

    What is the enzyme responsible for the isomerization reaction in glycogenesis?

    <p>Phosphoglucomutase</p> Signup and view all the answers

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