$\alpha$-$helix$ is a secondary structure of proteins formed by twisting of polypeptide chain into right-handed screw-like structures. Which type of interactions are responsible for making the $\alpha$-$helix$ structure stable?

  • A
    Hydrogen bonding
  • B
    Van der Waals forces
  • C
    Ionic bonding
  • D
    Covalent bonding

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