JEE MainChemistryBiomolecules
The secondary structures of proteins, such as the -helix and -pleated sheet, arise due to the regular folding of the polypeptide chain. This folding is primarily stabilized by hydrogen bonding between which of the following specific groups?
Options
- ATerminal - NH ₂ and - COOH groups of the polypeptide chain
- BSide chain ( -R ) groups of the constituent amino acids
- C- OH and - C=O groups present in the amino acid residues
- D- C=O and - NH - groups of the peptide bonds
Correct answer
D. - C=O and - NH - groups of the peptide bonds
Step-by-step solution
The secondary structure of a protein refers to the shape in which a long polypeptide chain exists, such as -helix and -pleated sheet. These structures arise due to the regular folding of the backbone of the polypeptide chain. This folding is stabilized by hydrogen bonding between the carbonyl oxygen ( - C=O ) of one peptide bond and the amide hydrogen ( - NH - ) of another peptide bond along the backbone. Interactions between side chain ( -R ) groups are primarily responsible for the tertiary structure, while termi