What is represented by the base root of a phylogenetic tree?

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

Number and variety of living organism; includes genetic, species, and ecological types

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.