Which of the following best describes the relationship between the shape of enzymes and the reactions they catalyze

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

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.

What is one reason why transpiration is important in plants? question 19 options: it produces food from the sugar in the plant cells. it enables the flow of water out of the plant. it produces carbon dioxide in the leaves of the plant.