In the mitogen activated protein kinase pathway, the activation of RAS is counteracted by:: (A) Protein kinase C, (B) GTPase activating protein, (C) Phosphatidyl inositol, (D) Inositol triphosphate
Answer is B. Activated RAS is present in association with GTP. Enzyme GTPase will degrade GTP to GDP and result in inactivation of ras. Thus, GTPase activating protein will counteract the activation of ras.