Maximum energy is liberated by the hydrolysis of
**Core Concept**
The question tests the understanding of **high-energy phosphate compounds** and their role in energy liberation during hydrolysis. These compounds, such as **ATP (Adenosine Triphosphate)**, **GTP (Guanosine Triphosphate)**, **phosphoenolpyruvate**, and **creatine phosphate**, are crucial in cellular energy transfer.
**Why the Correct Answer is Right**
The correct answer, **phosphoenolpyruvate**, liberates the maximum energy upon hydrolysis due to its high-energy phosphate bond, which has a high **phosphoryl group transfer potential**. This potential allows for the efficient transfer of a phosphate group to **ADP (Adenosine Diphosphate)**, forming **ATP** and releasing a significant amount of energy.
**Why Each Wrong Option is Incorrect**
**Option A:** ATP is a high-energy compound but does not release the maximum energy upon hydrolysis compared to phosphoenolpyruvate.
**Option B:** GTP is similar to ATP in terms of energy release and is not the compound that liberates the maximum energy.
**Option D:** Creatine phosphate is a high-energy compound found in muscle cells, but its energy release upon hydrolysis is not the maximum.
**Clinical Pearl / High-Yield Fact**
Remember that **phosphoenolpyruvate** is a key intermediate in glycolysis and gluconeogenesis, and its high-energy phosphate bond is crucial for energy production in the cell.
**Correct Answer:** D. phosphoenolpyruvate