Praxis II Biology

Answer: A, In glycolysis, one molecule of glucose produces 2 net molecules of ATP. The process requires 2 molecules of ATP to complete and produces 4 molecules of ATP, resulting in a net production of 2 molecules of ATP.

Key Takeaway: Glycolysis is the first stage of aerobic respiration and it takes place in the cytoplasm. It is the only step in aerobic respiration that occurs outside the mitochondria. ATP is required to split one molecule of glucose into two molecules of pyruvate, extracting ATP stored in glucose in the process. Those pyruvate molecules are then used in the Krebs’ cycle to produce more ATP.