Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

8. Protein Function

Glycogen Phosphorylase

Biochemistry

8. Protein Function

Glycogen Phosphorylase

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Multiple Choice

Which of the following stimulates glycogen breakdown by activating glycogen phosphorylase?

Epinephrine

Glucose-6-phosphate

Insulin

ATP

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Verified step by step guidance

Step 1: Understand the role of glycogen phosphorylase in glycogen breakdown. Glycogen phosphorylase is an enzyme that catalyzes the release of glucose-1-phosphate from glycogen, a process known as glycogenolysis.

Step 2: Recognize the signaling pathways involved in glycogen breakdown. Glycogen phosphorylase is activated by phosphorylation, which is triggered by signaling molecules such as hormones.

Step 3: Analyze the options provided. Epinephrine is a hormone that binds to receptors on the cell surface, initiating a cascade that activates protein kinase A (PKA). PKA phosphorylates glycogen phosphorylase, stimulating glycogen breakdown.

Step 4: Consider the other options. Glucose-6-phosphate is a product of glycogen breakdown and does not activate glycogen phosphorylase. Insulin promotes glycogen synthesis, not breakdown. ATP is an energy molecule and does not directly activate glycogen phosphorylase.

Step 5: Conclude that epinephrine is the correct answer because it triggers the signaling cascade that leads to the activation of glycogen phosphorylase, facilitating glycogen breakdown.