Consider the Following Metabolic Reaction Important in Muscle and Nerve $\leftrightarrows$

Multiple Choice

Consider the following metabolic reaction important in muscle and nerve cells:
ATP + creatine $\leftrightarrows$ phosphocreatine + ADP $\Delta$ G°' = +12.6 kJ/mol
Under intracellular conditions,the $\Delta$ G for the reaction,which is catalyzed by the enzyme creatine kinase,is ~0 kJ/mol.From this information we can conclude that

A) creatine kinase catalysis would not be necessary under intracellular conditions.
B) ATP has a greater phosphoryl group transfer potential compared to phosphocreatine.
C) at equilibrium,most intracellular creatine is phosphorylated.
D) the reaction operates close to equilibrium in cells.
E) None of the above is a correct conclusion.