A single molecule of haemoglobin is composed of:
Correct answer: B. Four polypeptide chains
- A. Three polypeptide chains
- B. Four polypeptide chains
- C. Five polypeptide chains
- D. Six polypeptide chains
Explanation
Haemoglobin is a quaternary structure therefore its composed of four polypeptide chains, 2 alpha globins and 2 beta globins. Therefore the answer will be B.
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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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