Question

insulin is a hormone that regulates blood sugar. when insulin binds to receptors on the outside of cells, it causes those cells to take in glucose, which lowers blood sugar levels. to which group of biomolecules does insulin belong? carbohydrates lipids nucleic acids proteins

Explanation:

Insulin is a peptide - hormone composed of amino acids. Amino acids are the building blocks of proteins. So insulin belongs to proteins.

Answer:

D. proteins