The following statements describe three orders of the structure of the insulin molecule. The molecule consists of two polypeptide chains joined and folded around one another. The sequence and number of amino acids in each polypeptide chain are known. The amino acids in each chain are coiled into alpha-helix and held in position by hydrogen bonds. Which order is described by each statement?
Correct answer: D. Option D
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
The primary structure of a protein is defined as the sequence of amino acids linked together to form a polypeptide chain Secondary structure refers to regular, recurring arrangements in space of adjacent amino acid residues in a polypeptide chain. The tertiary structure of a protein refers to the overall three-dimensional arrangement of its polypeptide chain in space The quaternary structure of a protein is the association of several protein chains or subunits into a closely packed arrangement
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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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