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BIO NMDCAT Proteins
nmdcat.online June 29, 2026

The characteristic feature of the peptide bond in a protein backbone is its

A. Free rotation, similar to a single bond
B. Rigid and planar nature due to partial double-bond character
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C. Ionic nature, which makes it highly soluble in water
D. Ability to form disulfide bridges with other peptide bonds

📝 Explanation

The peptide bond exhibits resonance between the carbonyl oxygen and the amide nitrogen. This resonance gives the C-N bond approximately 40% double-bond character, restricting rotation and making the six atoms of the peptide group lie in a single plane.

📖 Additional Information

  • Free rotation, similar to a single bond
  • Rigid and planar nature due to partial double-bond character
  • Ionic nature, which makes it highly soluble in water
  • Ability to form disulfide bridges with other peptide bonds

The peptide bond exhibits resonance between the carbonyl oxygen and the amide nitrogen. This resonance gives the C-N bond approximately 40% double-bond character, restricting rotation and making the six atoms of the peptide group lie in a single plane.

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