a number of mutations have been described in the g protein ras that have profound effects on its activity. for example, some mutations greatly increase the affinity of the g protein for gdp, making it very difficult for gdp to be exchanged for gtp. other mutations prevent the gtpase activity of ras, preventing it from causing the hydrolysis of gtp to gdp. which of the scenarios would result in a persisting proliferation response to growth factor receptor activation after the ligand is no longer binding to its receptor kinase?

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary