This first stage of carbohydrate breakdown starts and ends in the cytoplasm of all cells. Opposite, for clarity, we track only the six carbon atoms (black balls) that enter the reactions as part of glucose. Cells invest two ATP to start glycolysis, so the net energy yield from one glucose molecule is two ATP. Two NADH also form, and two pyruvate molecules are the end products.This first stage of carbohydrate breakdown starts and ends in the cytoplasm of all cells. Opposite, for clarity, we track only the six carbon atoms (black balls) that enter the reactions as part of glucose. Cells invest two ATP to start glycolysis, so the net energy yield from one glucose molecule is two ATP. Two NADH also form, and two pyruvate molecules are the end products.
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