It involves all the four structural levels of proteins:
Correct answer: D. Hemoglobin molecule
- A. Insulin
- B. α-helix
- C. Alpha chain of hemoglobin
- D. Hemoglobin molecule
Explanation
The correct answer is the Hemoglobin molecule. Hemoglobin is a complex protein consisting of four polypeptide chains, each having its primary, secondary, and tertiary structures. These chains come together to form a quaternary structure, thus involving all four structural levels of proteins. In contrast, Insulin is a single-chain peptide hormone, lacking quaternary structure. The α-helix is a secondary structural element, not a complete protein structure. Lastly, the Alpha chain of hemoglobin alone does not form a quaternary structure, as it is only part of the hemoglobin molecule.
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