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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About Biological Molecules
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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