What is an estuary?
a. where a freshwater river runs into an extension of the ocean
b. where a freshwater river runs into an extension of a lake
c. where a freshwater river runs into land
d. where a freshwater river runs into another river

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.