- Phosphoenolpyruvate (PEP): This high-energy phosphate compound is generated during glycolysis, the first stage of cellular respiration, and is used to produce ATP, the energy currency of cells.

- Adenosine diphosphate (ADP): ADP is a nucleotide that readily accepts phosphate groups to become ATP. Cellular respiration and photophosphorylation, which occur in the mitochondria and chloroplasts, respectively, generate ATP from ADP.

- Creatine phosphate (CP): Found in skeletal muscles, CP serves as a quick energy reserve. It can transfer its phosphate group to ADP, regenerating ATP, during intense physical activities when the demand for energy is high.

- Guanosine diphosphate (GDP): Similar to ADP, GDP can accept phosphate groups to become guanosine triphosphate (GTP), another essential molecule involved in cellular energy metabolism.

These phosphate-containing compounds play crucial roles in energy production, storage, and transfer within the cell, ensuring the availability of ATP for various cellular processes and activities.