Which biomolecule class is formed when amino acids are linked together by peptide bonds?

Which biomolecule class is formed when amino acids are linked together by peptide bonds?

• A. Carbohydrates
• B. Lipids
• C. Proteins
• D. Nucleic acids

Answer: (C)

Joining amino acids by peptide bonds creates proteins. A peptide bond forms when the amino group of one amino acid reacts with the carboxyl group of another, releasing water in a condensation reaction. This links amino acids into a polypeptide chain that folds into a functional protein with specific structure and activity. Carbohydrates are built from sugar units linked by glycosidic bonds, lipids are assembled from glycerol and fatty acids via ester bonds and are not polymers of amino acids, and nucleic acids are polymers of nucleotides joined by phosphodiester bonds. So, the biomolecule class formed by linking amino acids with peptide bonds is proteins.

Joining amino acids by peptide bonds creates proteins. A peptide bond forms when the amino group of one amino acid reacts with the carboxyl group of another, releasing water in a condensation reaction. This links amino acids into a polypeptide chain that folds into a functional protein with specific structure and activity. Carbohydrates are built from sugar units linked by glycosidic bonds, lipids are assembled from glycerol and fatty acids via ester bonds and are not polymers of amino acids, and nucleic acids are polymers of nucleotides joined by phosphodiester bonds. So, the biomolecule class formed by linking amino acids with peptide bonds is proteins.