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

Myoglobin vs. Hemoglobin

Biochemistry

8. Protein Function

Myoglobin vs. Hemoglobin

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Multiple Choice

Which of the following statements are true?

Both myoglobin and hemoglobin irreversibly bind oxygen gas (O₂).

Myoglobin has a single subunit, whereas hemoglobin has four identical subunits.

Hemoglobin and myoglobin each contain a single heme group.

Each individual subunit of hemoglobin contains a heme group.

Hemoglobin transports, stores and supplies oxygen in the muscle tissue.

A and B.

A and C.

B and C.

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Verified step by step guidance

Understand the structure and function of myoglobin and hemoglobin: Myoglobin is a monomeric protein with a single polypeptide chain and one heme group, primarily found in muscle tissue, where it stores oxygen. Hemoglobin is a tetrameric protein composed of four subunits, each with its own heme group, and is responsible for oxygen transport in the blood.

Evaluate the statement about oxygen binding: Myoglobin binds oxygen reversibly, allowing it to release oxygen when needed by muscle cells. Hemoglobin also binds oxygen reversibly, facilitating oxygen transport from the lungs to tissues and carbon dioxide transport back to the lungs.

Analyze the subunit composition: Myoglobin has a single subunit, while hemoglobin consists of four subunits (two alpha and two beta chains), each capable of binding one oxygen molecule due to the presence of a heme group in each subunit.

Consider the heme group presence: Both myoglobin and each subunit of hemoglobin contain a heme group, which is essential for their oxygen-binding capability.

Review the function of hemoglobin: Hemoglobin's primary role is to transport oxygen from the lungs to tissues and facilitate the return of carbon dioxide from tissues to the lungs. It does not store oxygen in muscle tissue; that is the role of myoglobin.