JEE Main · ChemistryHard

Which statement correctly describes the secondary structure of proteins regarding hydrogen bonding?

  1. A.In an , hydrogen bonds form between the carbonyl oxygen of one residue and the amide hydrogen of the residue four positions away.
  2. B.In a , hydrogen bonds are formed between side chains of adjacent strands.
  3. C.The is stabilized primarily by hydrophobic interactions between the backbone atoms.
  4. D.Parallel are more stable than anti-parallel due to linear hydrogen bonding.
Show correct answer & step-by-step solution

Correct answer: A — In an , hydrogen bonds form between the carbonyl oxygen of one residue and the amide hydrogen of the residue four positions away.

Solution

  1. The is a right-handed coil stabilized by hydrogen bonds.
  2. The hydrogen bond occurs between the group of amino acid and the group of amino acid .
  3. involve hydrogen bonds between backbone atoms of different strands, not side chains.
  4. Anti-parallel are generally more stable than parallel ones due to the geometry of the hydrogen bonds.
  5. Hence the answer is (A).

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