Question

Name the linkage that holds amino acids together in a protein.

• A. Glycosidic bond
• B. Ester bond
• C. Peptide bond
• D. Hydrogen bond

Hint:

Remember: Proteins are made of amino acids joined by peptide bonds, carbohydrates by glycosidic bonds, and lipids by ester bonds.

Answer 1

The Correct Option is C

Concept: Proteins are polymers made up of amino acid monomers. The bond that links two amino acids together is called a peptide bond.

Step 1: Structure of amino acids. Each amino acid contains:
• An amino group (\(-NH_2\))
• A carboxyl group (\(-COOH\))
• A hydrogen atom
• A variable side chain (R-group)

Step 2: Formation of peptide bond. A peptide bond forms when the carboxyl group of one amino acid reacts with the amino group of another amino acid.

Step 3: Condensation reaction. During this reaction, a molecule of water is released, forming a peptide linkage: \[ -CO-NH- \] This process forms long chains called polypeptides which fold into proteins.