Question

Which of the following statement is not true about secondary structure of protein?

• A. The alpha helix, beta pleated sheet and beta turns are examples of secondary structure of protein.
• B. The ability of peptide bonds to form intramolecular hydrogen bonds is important to secondary structure.
• C. The steric influence of amino acid residues is important to secondary structure.
• D. Thehydrophilic/ hydrophobic character of amino acid residues is important to secondary structure.

Answer 1

Answer: (D)

The hydrophilic/ hydrophobic character of amino acid residues is important to tertiary structure of protein rather than to secondary structure. In secondary structure, it is the steric size of the residues that is important and residues are positioned to minimise interactions between each other and the peptide chain.