The role of protein phosphatases in the cell is to
a. hydrolyze atp and gtp to adp and gdp
b. remove phosphoryl groups from proteins
c. transfer phosphoryl groups from atp to target proteins
d. activate pi-3-kinase
e. none of the above

The correct answer is b. remove phosphoryl groups from proteins.

Explanation:

The word phosphatase has the whole meaning of the function of this particular enzyme. Phospha- is from phosphorus or phosphoryl groups and the last part (-ase) always mean break or remove. Then, the phosphatase removes phosphoryl groups from proteins.

the correct answer is:

a population changes in response to a change in the environment.