Amino acid and protein hormones usually act by binding to a receptor on the cell surface.

Name: Amino acid and protein hormones usually act by binding to a receptor on the cell surface.
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Amino acid and protein hormones are generally hydrophilic and cannot easily cross the lipid bilayer of cell membranes. Therefore, they bind to specific receptors on the surface of target cells to exert their effects, typically through second messenger systems.

Amino Acid and Protein Hormones Usually Act by Binding to a Receptor