The helical structure of a protein is kept by the formation of hydrogen bond between amino acid molecules which are:
Correct answer: B. In successive spiral turns
- A. Adjacent to each other
- B. In successive spiral turns
- C. Between two different polypeptide chains
- D. None of the given options
Explanation
The most common types of secondary structures are the α helix and the β pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl 'O' of one amino acid and the amino 'H' of another. Hydrogen bonding between amino groups and carboxyl groups in neighboring/adjacent regions of the protein chain sometimes causes certain patterns of folding to occur. Known as alpha helices and beta sheets, these stable folding patterns make up the secondary structure of a protein.
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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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