Haemoglobin is classified as a conjugated protein because it
Correct answer: D. contains a non protein haem group attached to its polypeptide chains
- A. consists of four identical polypeptide chains
- B. contains only amino acids joined by peptide bonds
- C. is made in the bone marrow rather than the liver
- D. contains a non protein haem group attached to its polypeptide chains
Explanation
A conjugated protein is a protein permanently joined to a non protein prosthetic group, and in haemoglobin each of the four chains carries an iron containing haem that actually binds the oxygen. Without the haem the globin protein alone could carry nothing. Glycoproteins and lipoproteins are conjugated in the same sense, with a carbohydrate or lipid group instead.
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About Conjugated Molecules
Conjugated molecules contain a non-protein component attached to a protein portion, giving the molecule properties that a simple protein lacks. The content includes glycoproteins, lipoproteins, phosphoproteins, nucleoproteins, chromoproteins and metalloproteins, with attention to their prosthetic groups and roles in transport, protection, catalysis and cellular structure.
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