Which reaction releases energy?A. ADP + phosphate → ATP + H2OB. ATP + H2O → ADP + phosphateC. AMP + phosphate → ADP + H2OD. AMP + H2O → ATP + phosphate

To determine which reaction releases energy, we need to analyze the given options:

A. ADP + phosphate → ATP + H2O B. ATP + H2O → ADP + phosphate C. AMP + phosphate → ADP + H2O D. AMP + H2O → ATP + phosphate

In general, the release of energy occurs when a high-energy compound is converted into a lower-energy compound. In this case, ATP (adenosine triphosphate) is a high-energy compound, while ADP (adenosine diphosphate) and AMP (adenosine monophosphate) are lower-energy compounds.

Option B, ATP + H2O → ADP + phosphate, represents the hydrolysis of ATP, where water is added to break the bond between the last phosphate group and ATP. This reaction releases energy and is commonly observed in cellular processes.

Therefore, the correct answer is B. ATP + H2O → ADP + phosphate, as this reaction releases energy.