For most enzymatic reactions that involve ATP as a phosphory

For most enzymatic reactions that involve ATP as a phosphoryl donor O the free energy change in vivo is similar to that of Delat G\'o of ATP hydrolysis. ADP can also be used O the true substrate is MgATP2 G) the energy released is based on the cellular concentrations of ATP, ADP and P AMP can also be used.

Solution

Here the correct answer is (The true substrate is MgATP 2- )..when ATP acts as a phosphoryl group donor,then Mg 2+ in the cytosol binds with ATP and ADP and partially shield the negative charge and form MgATP 2-...