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nmdcat.online June 27, 2026

In the secondary structure of proteins, the β-pleated sheet is primarily stabilized by

A. Disulfide bridges between cysteine amino acids
B. Hydrogen bonds between the carbonyl and amino groups of the backbone
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C. Hydrophobic interactions between non-polar R-groups
D. Ionic bonds between oppositely charged R-groups

📝 Explanation

Both α-helices and β-pleated sheets are secondary structures stabilized by regular hydrogen bonding between the backbone atoms (the C=O of one amino acid and the N-H of another). R-group interactions define the tertiary structure. Disulfide bridges are covalent, not hydrogen, bonds.

📖 Additional Information

  • Disulfide bridges between cysteine amino acids
  • Hydrogen bonds between the carbonyl and amino groups of the backbone
  • Hydrophobic interactions between non-polar R-groups
  • Ionic bonds between oppositely charged R-groups

Both α-helices and β-pleated sheets are secondary structures stabilized by regular hydrogen bonding between the backbone atoms (the C=O of one amino acid and the N-H of another). R-group interactions define the tertiary structure. Disulfide bridges are covalent, not hydrogen, bonds.

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