Question

The G-protein coupled receptors have their _____________________ outside the cell.

(a) amino terminus

(b) carboxyl terminus

(c) alpha helices

(d) beta helices

I had been asked this question in unit test.

Query is from Cell Signaling and Signal Transduction topic in portion Cell Signaling and Signal Transduction of Cell Biology

Answer 1

Right answer is (a) amino terminus

To explain: The G-protein coupled receptors have their amino-terminus outside the cell and carboxyl-terminus inside the cell. The 7 transmembrane helices (alpha-helices) traverse the plasma membrane.