Exemplar Problems

Question:

What is the significance of glycolysis in cellular respiration?

Answer:

• Glycolysis is the initial step of cellular respiration that occurs in the cytoplasm of cells.

• It plays several significant roles in cellular respiration:

• Glycolysis breaks down one molecule of glucose into two molecules of pyruvate, producing a small amount of ATP (2 ATP) and NADH.

• It operates under both aerobic and anaerobic conditions, making it a versatile energy-generating pathway.

• In the absence of oxygen, pyruvate produced during glycolysis can undergo fermentation to generate ATP.

• Glycolysis also generates high-energy molecules (ATP and NADH) that feed into the subsequent stages of cellular respiration (citric acid cycle and electron transport chain) under aerobic conditions.