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ATP is one of the most important energy storage molecules in cells. There are also other energy storage molecules, though. Creatine is one of them.

Many bodybuilders and athletes increase their intake of creatine to improve performance. Once ATP has been used up, phosphocreatine (creatine with a phosphate group) can be used to recreate ATP by transferring its phosphate to ADP. This reaction is shown below.

Phosphocreatine + ADP $\rightarrow$ Creatine + ATP
For this reaction to proceed, the net $\Delta \text{G}$ must be
Select Option postivenegative
. In order for this to occur,
Select Option phosphocreatine $\rightarrow$ creatine + ${P}_{i}$ATP $\rightarrow$ ADP + ${P}_{i}$
must have a larger $-\Delta \text{G}$ than
Select Option phosphocreatine $\rightarrow$ creatine + ${P}_{i}$ATP $\rightarrow$ ADP + ${P}_{i}$
.
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