Which element is a major component of the disulfide bonds in proteins?

Which element is a major component of the disulfide bonds in proteins?

• A. Hydrogen
• B. Oxygen
• C. Sulfur
• D. Nitrogen

Answer: (C)

Disulfide bonds stabilize protein structure by forming covalent links between sulfur atoms in cysteine residues. The bond is specifically an S–S linkage, so sulfur is the element involved. Hydrogen, oxygen, and nitrogen participate in other types of bonds and interactions in proteins, but the disulfide bridge itself relies on sulfur atoms connecting two cysteines.

Disulfide bonds stabilize protein structure by forming covalent links between sulfur atoms in cysteine residues. The bond is specifically an S–S linkage, so sulfur is the element involved. Hydrogen, oxygen, and nitrogen participate in other types of bonds and interactions in proteins, but the disulfide bridge itself relies on sulfur atoms connecting two cysteines.