Exemplar Problems

Question:

Describe the regulation of glycolysis in response to cellular energy needs, including the role of key enzymes and allosteric regulation.

Answer:

Glycolysis is regulated to match cellular energy demands. Key enzymes, such as hexokinase, phosphofructokinase (PFK), and pyruvate kinase, are subject to allosteric regulation. High ATP levels inhibit PFK, while low ATP levels and high ADP and AMP levels activate PFK. Pyruvate kinase is inhibited by ATP and activated by fructose-1,6-bisphosphate. These regulatory mechanisms ensure that glycolysis responds to the cell’s energy status.