Multiple choice In a signal transduction involving G-Protein, GDP/GTP exchange is promoted by GAPs RGS proteins GEFs AGS Ras Reveal answer Fill a bubble to check yourself C Correct answer Explanation Guanine nucleotide Exchange Factors promote GDP/GTP binding. The G-protein coupled receptor in a G-Protein mediated cyclic AMP signal proteins cascades acts like a GEF factors by promoting the G-proteins exchange efficiency for the GTP.