Unlike external stimuli, internal stimuli: a. do not have multiple sources. b. cannot be satisfied through purchases. c. include stimuli such as hunger and thirst. d. include stimuli such as advertisements and videos.

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.