How are enzymes affected by the chemical reaction?

How does human environment effect the biosphere

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.

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%