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The peptide C=O bond of the nth residue of the backbone of alpha-helix points along and forms a hydrogen bond with the peptide N—H group of which among the following residue?
  • a)
    (n+1)th
  • b)
    (n+2)th
  • c)
    (n+3)th
  • d)
    (n+4)th
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The peptide C=O bond of the nth residue of the backbone of alpha-helix...
The peptide C=O bond of the nth residue of the backbone of alpha-helix points along and forms a hydrogen bond with the peptide N—H group of the (n+4)th residue.This arrangement results in the formation of a strong hydrogen bond, which has nearly optimum N—O distance (2.8 Armstrong). Moreover, in the core of the helix, the atoms are in van der Waals contact, because the core of the helix is tightly packed.
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The peptide C=O bond of the nth residue of the backbone of alpha-helix...

Explanation:

Hydrogen bonding in alpha-helix structure:
- In an alpha-helix structure, the peptide C=O bond of the nth residue forms a hydrogen bond with the peptide N-H group of the (n+4)th residue.
- This hydrogen bonding pattern helps stabilize the alpha-helix structure.

Specific interaction:
- In this case, the peptide C=O bond of the nth residue points along and forms a hydrogen bond with the peptide N-H group of the (n+4)th residue.
- This specific interaction is a characteristic feature of the alpha-helix structure.

Correct answer:
- The correct option is (n+4)th residue, as the hydrogen bonding occurs between the C=O bond of the nth residue and the N-H group of the (n+4)th residue.
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The peptide C=O bond of the nth residue of the backbone of alpha-helix points along and forms a hydrogen bond with the peptide N—H group of which among the following residue?a)(n+1)thb)(n+2)thc)(n+3)thd)(n+4)thCorrect answer is option 'D'. Can you explain this answer? for MCAT 2025 is part of MCAT preparation. The Question and answers have been prepared according to the MCAT exam syllabus. Information about The peptide C=O bond of the nth residue of the backbone of alpha-helix points along and forms a hydrogen bond with the peptide N—H group of which among the following residue?a)(n+1)thb)(n+2)thc)(n+3)thd)(n+4)thCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for MCAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The peptide C=O bond of the nth residue of the backbone of alpha-helix points along and forms a hydrogen bond with the peptide N—H group of which among the following residue?a)(n+1)thb)(n+2)thc)(n+3)thd)(n+4)thCorrect answer is option 'D'. Can you explain this answer?.
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