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

Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism

Glycogen Metabolism 1

Biochemistry

Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism

Glycogen Metabolism 1

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Multiple Choice

Which of the following structures represents a phosphorylated subunit of glycogen as described in the passage?

A glucose residue within glycogen with a phosphate group attached to the C6 position (glucose-6-phosphate)

A glycogen phosphorylase subunit with a phosphate group covalently attached to a serine residue

A glucose residue within glycogen with a phosphate group attached to the C1 position (glucose-1-phosphate)

A branch point in glycogen where two glucose residues are linked by an $oldsymbol{ext{α}}$-1,6-glycosidic bond

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Verified step by step guidance

Step 1: Understand the context of the problem. Glycogen phosphorylase is an enzyme involved in glycogen breakdown. It is regulated by phosphorylation, which activates the enzyme. The phosphorylation occurs on a specific amino acid residue, typically serine, within the enzyme's structure.

Step 2: Analyze the options provided. The question asks for the structure that represents a phosphorylated subunit of glycogen. This implies the focus is on the enzyme glycogen phosphorylase, not the glucose residues within glycogen.

Step 3: Eliminate incorrect options. Glucose-6-phosphate and glucose-1-phosphate are intermediates in glycogen metabolism but do not represent the phosphorylated subunit of glycogen phosphorylase. Similarly, the branch point in glycogen with an α-1,6-glycosidic bond is a structural feature of glycogen, not the enzyme.

Step 4: Focus on the correct option. Glycogen phosphorylase is activated by the covalent attachment of a phosphate group to a serine residue within its structure. This phosphorylation alters the enzyme's conformation, enabling it to catalyze the breakdown of glycogen.

Step 5: Conclude that the correct answer is the glycogen phosphorylase subunit with a phosphate group covalently attached to a serine residue, as this represents the phosphorylated form of the enzyme involved in glycogen metabolism.