This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
G-coupled protein receptor is: 
Select and explain. 
A. Metabotropic receptor, B. Ionic receptor, C. Kinase-linked receptor, D. Nuclear receptor
A: Metabotropic receptor
Answer: A: Metabotropic receptor 
Explanation: 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