Final answer:
In glycolysis, 2 ATP molecules are used and 4 ATP molecules are produced for each 6-carbon glucose molecule.
Step-by-step explanation:
In glycolysis, a 6-carbon sugar molecule called glucose is phosphorylated and split into two 3-carbon molecules. During the process, 2 ATP molecules are used. Next, each 3-carbon molecule goes through a series of reactions that produce 2 net ATP molecules each.
Therefore, a total of 4 ATP molecules are produced. Overall, in glycolysis, 2 ATP molecules are used and 4 ATP molecules are produced for each 6-carbon glucose molecule.