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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?

$Glucose-1-phosphate$ Signup and view all the answers

What are the two major tissues for glycogen storage?

Muscle and liver Signup and view all the answers

What is the main function of muscle glycogen?

Provides the energy source for strenuous activity Signup and view all the answers

What is the structure of glycogen?

Linear chains of a-1,4 linked glucose units with a-1,6 linkages forming a branched macromolecule Signup and view all the answers

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

$Glucose ext{-}1 ext{-}phosphate$ Signup and view all the answers

What is the average chain length for glycogen?

$10-12$ glucose units per chain Signup and view all the answers

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

$Debranching$ $enzyme$ Signup and view all the answers

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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Description

Test your knowledge of glycogen metabolism, including its structure, breakdown, synthesis, regulation of enzymes, and storage diseases. Explore the functions of glycogen as the storage form of glucose in eukaryotic cells, particularly in the liver and muscle tissues.