Final answer:
Phosphofructokinase is activated by high levels of adenosine monophosphate (AMP), which is beneficial for cell metabolism as it promotes glucose breakdown and ATP production.
Step-by-step explanation:
Glycolysis is a series of metabolic reactions that break down glucose into pyruvate, generating ATP in the process. Phosphofructokinase, a key enzyme in glycolysis, is activated by high levels of adenosine monophosphate (AMP), which is a result of low ATP levels. This activation of phosphofructokinase allows for an increase in glycolytic rate, promoting glucose breakdown and ATP production in the cell.