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nmdcat.online June 27, 2026

The stabilizing factor for the secondary structure of proteins, such as α-helices and β-pleated sheets, is hydrogen bonding that occurs between atoms

A. In the R-groups of polar amino acids
B. In the side chains of non-polar amino acids
C. Forming the backbone of the polypeptide chain
✓
D. Of the disulfide bridges between cysteines

📝 Explanation

Secondary structures are defined by the pattern of hydrogen bonds between the carbonyl oxygen (C=O) and the amide hydrogen (N-H) of the peptide backbone itself. The R-groups are not involved; their interactions define the higher-level tertiary structure.

📖 Additional Information

  • In the R-groups of polar amino acids
  • In the side chains of non-polar amino acids
  • Forming the backbone of the polypeptide chain
  • Of the disulfide bridges between cysteines

Secondary structures are defined by the pattern of hydrogen bonds between the carbonyl oxygen (C=O) and the amide hydrogen (N-H) of the peptide backbone itself. The R-groups are not involved; their interactions define the higher-level tertiary structure.

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