Hemoglobin molecule exhibits which structural organization of proteins___________?
Correct answer: D. Quaternary structure
- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation
A haemoglobin molecule is made of four polypeptide subunits, usually two alpha and two beta chains, each containing a haem group. The association of these separate chains gives haemoglobin a quaternary structure. Students may choose c because each individual subunit has tertiary structure, but the complete haemoglobin molecule is described by its quaternary organization.
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About Proteins
Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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