The helical structure of proteins is stabilized by:
vander walls forces
The correct option is C hydrogen bonds The helical structure of proteins is stabilized by hydrogen bonds. In helical structure, the carbonyl oxygen atoms in $$C=O$$ points in one direction, towards the amide hydrogen atoms in $$NH$$ groups, 4 residues away. Together these groups form a hydrogen bond, one of the main forces of secondary structure stabilization in proteins. Hydrogen bonds are shown by dashed lines.