Antibodies are?
Correct answer: D. Quaternary proteins
- A. Primary proteins
- B. Secondary proteins
- C. Tertiary proteins
- D. Quaternary proteins
Explanation
Antibodies are proteins the immune system produces to identify and neutralize foreign objects like bacteria and viruses. They comprise four polypeptide chains - two heavy chains and two light chains - arranged in a Y-shaped structure. The overall structure of antibodies is known as quaternary structure, which refers to the arrangement of multiple protein subunits.
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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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