<prompt> G protein of G protein coupled receptors are attached to?Aminoterminal endCarboxyterminal endThird transmembrane domainSeventh transmembrane domain  <response>: Ans. is b i.e.,Carboxyterminal end G protein coupled receptors are receptors which are coupled to G protein G proteins are proteins which get activated on binding to GTP There are two types of G proteins Small G proteins Heterotrimeric G proteins G protein coupled receptors are coupled to heterotrimeric G proteins with a,p,y subunits The receptors cross the cell membrane 7 times. That makes them look like a snake. Hence they are called as serpentine receptors. These receptors being proteins, have an aminoterminal end and a carboxy terminal end. Aminoterminal end faces the extracellular side and the carboxy terminal end faces the cytoplasm. To this carboxy terminal end, is attached the G protein, with a, b, g subunits. 