<prompt> G-coupled protein receptor is:Metabotropic receptorIonic receptorKinase-linked receptorNuclear receptor  <response>: Metabotropic receptors- most common type of receptoors Involved in various metabolisms These receptors do not have ion channels as pa of their structure; instead, they affect channels by the activation of intermediate molecules called G-protein.For this reason, metabotropic receptors are also called G-protein-coupled receptors. They have a determinant - alpha subunit Adrenergic receptors are GPCRs Ref KD Tripathi 8th ed 