Question

54. Which of these receptor classes can activate G proteins

1. G protein coupled and ion channel receptors

2. Enzyme coupled receptors

3. G protein coupled receptors and enzyme coupled receptors

4. Ion channel coupled receptors

5. G protein coupled receptors

Answer 1

Option A :- Incorrect

Reason:-G protein coupled receptor is a large family of protein that interacts with the G protein and activates them. The activation of the G protein triggers production of secondary messengers.The GPCR and ion channel receptor are two different types of memberane receptors found on the cell membrane. The GPCR activates the C protein whereas ion channels receptor bind to ligands and open the membrane channel and allow specific ions to pass through it.

Option B :- incorrect

Reason:-G protein are activated by GPCRs not enzyme coupled receptor.

Option C:- Incorrect

Reason:-The GPCR is a large family of protein that activates the G proteins whereas enzyme coupled receptor have a small intracellular domain that directly interacts with enzymes.

Option D:- Incorrect

Reason:- Ion channel couples receptor are memberane receptor that bind to the ligand and opens up the members channel to allow the movement of specific ion .

Option E:- CORRECT

Reason:- G protein coupled receptor is a family of proteins. They are also called as GPCR, transmembrane receptor, heptahelical receptor protein. They interact with extracellular signals and substance and activates the G protein. The activation of G protein triggers the production of many secondary messengers.