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GATE2018-9

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Which one of the following is INCORRECT about protein structures?

  1. A protein fold is stabilized by favorable non-covalent interactions
  2. All parts of a fold can be classified as helices, strands or turns
  3. Two non-covalent atoms cannot be closer than the sum of their van der Waals radii
  4. The peptide bond is nearly planar

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