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GATE XE 2026 | Question: 139

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In a $\alpha$-helix, the $\text{R}$-groups on the amino acid residues

  1. are found on the outside of the helix
  2. participate in the backbone $\text{H}$-bonding that stabilize the helix
  3. allow formation of right-handed helices
  4. allow formation of left-handed helices

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