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BIO NMDCAT Proteins
nmdcat.online June 29, 2026

The peptide bond is unusually planar because of resonance. The atoms lying in the peptide plane are the

A. α-carbon, amino group, and R-group
B. Carbonyl carbon, carbonyl oxygen, amide nitrogen, amide hydrogen, and the two adjacent α-carbons
✓
C. Carbonyl carbon and amide nitrogen only
D. Entire side chains of both amino acids

📝 Explanation

Resonance restricts rotation around the peptide bond, making these six atoms coplanar.

📖 Additional Information

  • α-carbon, amino group, and R-group
  • Carbonyl carbon, carbonyl oxygen, amide nitrogen, amide hydrogen, and the two adjacent α-carbons
  • Carbonyl carbon and amide nitrogen only
  • Entire side chains of both amino acids

Resonance restricts rotation around the peptide bond, making these six atoms coplanar.

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