Which of the following is a conjugated protein?
Correct answer: B. haemoglobin
- A. albumin
- B. haemoglobin
- C. keratin
- D. fibroin
Explanation
Haemoglobin carries a non protein haem prosthetic group that does the actual oxygen binding, which makes it conjugated. Albumin, keratin and fibroin consist of polypeptide alone and yield only amino acids on hydrolysis. Glycoproteins and lipoproteins are conjugated in the same sense, with carbohydrate or lipid attached.
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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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