Question

collagen is a molecule made of many chains of amino acids twisted into a fiber. it provides structural support for skin, blood vessels, and muscles. to which group of biomolecules does collagen belong? carbohydrates lipids nucleic acids proteins

Explanation:

Proteins are polymers of amino - acids. Since collagen is made of many chains of amino - acids, it belongs to proteins. Carbohydrates are made of sugar units, lipids are non - polar molecules like fats and oils, and nucleic acids are made of nucleotides (DNA and RNA).

Answer:

proteins