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Proteins are found to have two different types of secondary structures viz α helix and β pleated sheet structure. α helix structure of protein is stabilised by
(a) peptide bonds                            (b) van der Waals, forces
(c) hydrogen bonds                         (d) dipole-dipole interactions


Solution

(c) Secondary structures of protein denote the shape in which a long polypeptide chain exists. The secondary structure exists in two type of structure α helix and β pleated structure.
In α helix structure, a polypeptide chain forms all possible hydrogen bonds by twisting into a right-handed screw with -NH group of each amino acid rest hydrogen bonded to>C=O of adjacent amino acid, which forms a helix.


Chemistry
NCERT Exemplar
Standard XII

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