Question

Insulin receptor is

• A. Dimeric protein
• B. G-protein
• C. Not a protein
• D. Intrinsic protein

Answer 1

The correct option is A Dimeric protein

Insulin is secreted by beta cells of islets of Langerhans of pancreas and decreases blood glucose level. Receptor for insulin is located on plasma membrane of cell i.e. a cell surface receptor. The receptor is a tyrosine kinase receptor. It consists of two 2 α and 2 β subunits. Hence, it is a dimeric protein. Binding of insulin with its receptor activate kinases which phosphorylate target proteins and cause changes in the target cells.

So, the correct answer is 'Dimeric protein'.