Question

The helical structure of protein is stabilized by:

• A. hydrogen bonds
• B. ether bonds
• C. peptide bonds
• D. dipeptide bonds

Answer 1

The correct option is D dipeptide bonds

• The helix is common in the secondary structure of proteins and is a right hand-spiral conformation (i.e. helix)
  
• In helix structure, every backbone $N-H$ group donates a hydrogen bond to the backbone $C=O$ group of the amino acid located three or four residues earlier along the protein sequence.