You're examining two different mutant liver cell lines in which gpk is only activated 50% when the cells are treated with epinephrine. in cell line "a" gpk is rapidly inactivated when epinephrine is removed. in cell line "b" gpk activity persists longer before it is fully inactivated. which of the following accounts for the difference between the two cell lines?
a. in cell line "a"; certain s or ts on the α+ β subunits of gpk were changed to e. in cell line "b"; certain s or ts on α+ β subunits of gpk were changed to a.
b. in cell line "a" certain s or ts on the α+ β subunits of gpk were changed to a. in cell line "b" the r subunits on pka were unable to bind dissociate from the c subunits in the presence of camp.
c. in cell line "a" certain s or ts on α+ β subunits of gpk were changed to e. in cell line "b" the er ca2+ channels could not bind ip3.
d. in cell line "a" certain s or ts on the α+ β subunits of gpk were changed to a. in cell line "b"; the er ca2+ channels could not bind ip3.
e. in cell line "a" the er ca2+ channels could not bind ip3. in cell line "b" certain s or ts on the α+ β subunits of gpk were changed to a.