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Questions and Answers

What is the primary function of glycogen in the body?

To regulate blood sugar levels during fasting

To store excess glucose from the bloodstream

To provide a continuous supply of glucose when needed (correct)

To act as a source of energy for muscle contraction

Which of the following statements about the structure of glycogen is correct?

It is a linear polymer of glucose residues linked by α1-4 glycosidic bonds

It is a random polymer of glucose residues with no specific linkage pattern

It has a highly branched structure with α1-4 and α1-6 glycosidic bonds (correct)

It is a cyclic polymer of glucose residues linked by β1-4 glycosidic bonds

Which of the following tissues can store the largest amount of glycogen?

Skeletal muscle (correct)

Brain

Liver

Adipose tissue

What is the advantage of glycogen's highly branched structure?

It provides many sites for rapid synthesis or degradation Signup and view all the answers

What is the limitation of glycogen storage in tissues?

Glycogen is a highly polar molecule that attracts a lot of water, limiting storage capacity Signup and view all the answers

What is the role of UTP in glycogen synthesis?

It is structurally similar and energetically equivalent to ATP, which is required for glycogen synthesis Signup and view all the answers

What is the primary role of UTP in the context of sugar metabolism?

It is a precursor for the synthesis of lactose and glycogen Signup and view all the answers

Which of the following statements about glycogen degradation is true?

It requires the action of glycogen phosphorylase and de-branching enzymes Signup and view all the answers

What is the fate of glucose-6-phosphate produced during glycogenolysis in muscle cells?

It is used as an energy source in glycolysis Signup and view all the answers

Which enzymes are involved in the regulation of glycogen metabolism through allosteric control and covalent modification?

Glycogen synthase and glycogen phosphorylase Signup and view all the answers

What is the primary function of glucose-6-phosphatase in the context of glycogen metabolism?

To release glucose from glucose-6-phosphate in the liver Signup and view all the answers

What are the potential consequences of glycogen storage diseases?

All of the above Signup and view all the answers