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Carbohydrate Metabolism: Glycogen Metabolism

18 Questions

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Carbohydrate Metabolism: Glycogen Metabolism

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Questions and Answers

What is the normal fasting blood glucose level?

Between 120 to 150 mg/dL

Less than 50 mg/dL

Between 70 to less than 100 mg/dL (correct)

Over 200 mg/dL

Which hormone decreases the activity of key enzymes in gluconeogenesis?

Insulin (correct)

Glucagon

Growth Hormone

Epinephrine

What happens to blood glucose level after a carbohydrate meal?

It fluctuates randomly

It remains stable

It decreases

It increases (correct)

During fasting for less than 18 hours, which source contributes to blood glucose?

Glycogenolysis Signup and view all the answers

Which hormones increase the activity of key enzymes in gluconeogenesis?

Glucagon Signup and view all the answers

How is the blood glucose level regulated after a carbohydrate meal?

Increases due to insulin secretion Signup and view all the answers

What inhibits glycogen phosphorylase?

Insulin Signup and view all the answers

What acts as an allosteric activator of the inactive dephosphorylated form of glycogen phosphorylase in muscles?

AMP Signup and view all the answers

Which molecule acts as an allosteric inhibitor for the active phosphorylase?

Glucose 6-P Signup and view all the answers

In gluconeogenesis, what is a direct precursor for glucose synthesis?

Lactate Signup and view all the answers

Which hormone stimulates glycogen phosphorylase in the liver?

Glucagon Signup and view all the answers

What is the main source of blood glucose, especially after 18 hours of fasting?

Glucogenic amino acids Signup and view all the answers

Which of the following statements about glycogen is correct?

Glycogen is a highly branched polymer of D-glucose. Signup and view all the answers

Which of the following is true about glycogenesis?

The key enzyme of glycogenesis is glycogen synthase. Signup and view all the answers

Which of the following statements about the regulation of glycogen synthesis is correct?

Glucose-6-phosphate inhibits inactive glycogen synthase. Signup and view all the answers

What is the definition of glycogenolysis?

The breakdown of glycogen to glucose-1-phosphate. Signup and view all the answers

Which enzyme is the key enzyme of glycogenolysis?

Glycogen phosphorylase Signup and view all the answers

What is the primary role of liver glycogen?

To maintain blood glucose between meals. Signup and view all the answers