Final answer:
Glycolysis results in a net gain of two ATP molecules and produces two molecules of NADH.
Step-by-step explanation:
Glycolysis is the process in which glucose is broken down into two pyruvate molecules. During glycolysis, there is a net gain of two ATP molecules. Two ATP molecules are used in the first stage of glycolysis, resulting in a net gain of two ATP. Additionally, glycolysis produces two molecules of NADH.