Which of the following statements is incorrect about the secondary structure of protein?

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It refers to the shape in which long polypeptide chain can exist.

It exists in two different type of structures, i.e. α-helix and β-pleated sheet structure

Its structure arises due to regular folding of the backbone of the polypeptide chain

There is the covalent bonding between and -NH groups of the peptide bond

answer is D.

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Detailed Solution

The secondary structure of proteins refers to the shape in which a long polypeptide chain can exist. They are found to exist in two different types of structures, i.e, α-helix and β-pleated sheet structure. These structures arise due to the regular folding of the backbone of the polypeptide chain due to hydrogen bonding between group of the peptide bond.

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