Hormones made of amino acids or proteins that bind to receptors on the surface of the cell are _______ hormones.

Peptide Hormones

Biomolecules that act as signaling molecules in the body, composed of short chains of amino acids.

Amino Acids

Organic compounds that combine to form proteins, serving as building blocks for life.

Receptors

Specialized cells or proteins on cell surfaces or within cells that bind to specific substances, triggering a cellular response.