Question

The most important factor responsible for the secondary structure of protein, example $\alpha$-helix is

• A. The sequence of amino acids
• B. Hydrogen bonds that form between carboxyl and amino group of different residues
• C. H-bond and other interaction between side chain
• D. The number, identity and arrangement of polypeptide that make up a protein

Answer 1

The correct option is B Hydrogen bonds that form between carboxyl and amino group of different residues

Protein secondary structure is the three-dimensional structure. The most common examples are beta sheet and an alpha helix. Alpha helix has right-handed spiral confirmation which is formed by the hydrogen bonds between the carboxyl and an amino group in three to four residue. Thus, the correct answer is 'Hydrogen bonds that form between carboxyl and amino group of different residues'.