The quaternary structure of a protein exists only when the molecule
Correct answer: C. consists of two or more polypeptide chains associated together
- A. contains a disulphide bridge
- B. is fibrous
- C. consists of two or more polypeptide chains associated together
- D. contains more than one hundred amino acids
Explanation
Quaternary structure describes how separate polypeptide subunits fit together, as in haemoglobin with its two alpha and two beta chains, and a single chain protein such as myoglobin therefore stops at the tertiary level. The subunits are held by the same weak interactions that stabilise tertiary structure. Chain length alone has nothing to do with it.
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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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