Question

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

• A. It refers to the shape in which long polypeptide chain can exist
• B. It exists in two different type of structures, i.e. $\alpha$-helix and $\beta$-pleated sheet structure
• C. Its structure arises due to regular folding of the backbone of the polypeptide chain
• D. There is the covalent bonding between $> C = O$ and $- NH$ groups of the peptide bond

Answer 1

Answer: (D)

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. $\alpha$-helix and $\beta$-pleated sheet structure. These structures arise due to the regular folding of the backbone of the polypeptide chain due to hydrogen bonding between $- \overset{\underset{||}{O}}{C} -$ and $- NH$ group of the peptide bond.