G-coupled protein receptor is:

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