Glycogen Metabolism Review Quiz

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Questions and Answers

What is the average chain length for glycogen?

  • 6-8 glucose units per chain
  • 12-14 glucose units per chain (correct)
  • 8-10 glucose units per chain
  • 15-18 glucose units per chain

What is the main function of liver glycogen?

  • Maintain glucose levels during fasting (correct)
  • Provide energy for strenuous activity
  • Store form of glucose in eukaryotic cells
  • Break down glycogen to yield glucose 1-phosphate

What is the ratio of Pi:G1P at equilibrium during glycogenolysis?

  • 1:3
  • 1:1
  • 1:2
  • 1:4 (correct)

What is the product of the reaction catalyzed by phosphorylase during glycogenolysis?

<p>$Glucose-1-phosphate$ (B)</p> Signup and view all the answers

What are the two major tissues for glycogen storage?

<p>Muscle and liver (A)</p> Signup and view all the answers

What is the main function of muscle glycogen?

<p>Provides the energy source for strenuous activity (B)</p> Signup and view all the answers

What is the structure of glycogen?

<p>Linear chains of a-1,4 linked glucose units with a-1,6 linkages forming a branched macromolecule (A)</p> Signup and view all the answers

What is the product of the reaction catalyzed by phosphorylase during glycogenolysis?

<p>$Glucose ext{-}1 ext{-}phosphate$ (B)</p> Signup and view all the answers

What is the average chain length for glycogen?

<p>$10-12$ glucose units per chain (B)</p> Signup and view all the answers

Which enzyme is responsible for breaking down the branches in glycogen during glycogenolysis?

<p>$Debranching$ $enzyme$ (D)</p> Signup and view all the answers

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Study Notes

Glycogen Structure and Function

  • Glycogen has a highly branched structure, with an average chain length of 10-14 glucose residues.
  • The two major tissues for glycogen storage are the liver and muscles.

Glycogenolysis

  • The main function of liver glycogen is to regulate blood glucose levels.
  • The main function of muscle glycogen is to provide energy for muscle contractions.
  • During glycogenolysis, the enzyme phosphorylase catalyzes the reaction that breaks down glycogen to glucose-1-phosphate (G1P).
  • The product of the reaction catalyzed by phosphorylase during glycogenolysis is glucose-1-phosphate (G1P).
  • The enzyme responsible for breaking down the branches in glycogen during glycogenolysis is debranching enzyme.
  • At equilibrium, the ratio of Pi:G1P is 1:1.

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