Regular coiling or zigzagging of polypeptide through hydrogen bonding is its_______________?
Correct answer: B. Secondary structure
- A. Quantum structure
- B. Secondary structure
- C. Tertiary structure
- D. Primary structure
Explanation
The regular alpha-helical coiling and beta-pleated zigzag arrangement of a polypeptide are produced mainly by hydrogen bonds between peptide backbone groups. These local folding patterns define secondary protein structure, whereas tertiary structure describes the overall three-dimensional folding of one chain. Choosing tertiary structure confuses local backbone folding with complete chain folding.
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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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