Which of the following contains amino acids?

Correct Answer: Collagen

Collagen is a structural protein composed of long chains of amino acids, making it one of the most abundant proteins in the human body. It is found in skin, bones, tendons, ligaments, cartilage, and connective tissues, where it provides strength, flexibility, and structural support. The primary amino acids present in collagen include glycine, proline, and hydroxyproline, which form its characteristic triple-helix structure. Unlike carbohydrates such as starch, glucose, and cellulose, collagen is entirely made of amino acids linked together by peptide bonds. Adequate collagen production is essential for healthy skin, wound healing, joint function, and maintaining strong connective tissues.

• Type: Structural protein.
• Building Blocks: Amino acids.
• Main Locations: Skin, bones, tendons, and cartilage.
• Function: Strength and structural support.
• Correct Answer: Collagen.