A) Primary structure
B) Secondary structure
C) Tertiary structure
D) Quaternary structure
Correct Answer: B
Solution :
Proteins are natural heteropolymer like substances of amino acids. There are four structural levels of proteins. (i) Primary structure Composed of linear array of amino acids. (ii) Secondary structure Most long polypeptide chains are folded to produce this. Three major types of secondary structure are \[\alpha -\]helix, \[\beta -\]pleated sheet,\[\beta \]confirmation. (iii) Tertiary structure This folding brings together active amino acids, which are otherwise scattered along the chain. (iv) Quaternary structure It shown by proteins containing more than one polypeptide chain.
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