What is produced when G3P molecules lose electrons during glycolysis?

During glycolysis, glyceraldehyde-3-phosphate (G3P) undergoes a series of enzymatic reactions where it is oxidized. When G3P molecules lose electrons, they are oxidized to form 1,3-bisphosphoglycerate. This oxidation involves the transfer of electrons to NAD+, reducing it to form NADH. NADH is a crucial electron carrier that stores energy for use in subsequent stages of cellular respiration, particularly during oxidative phosphorylation.

ATP is produced later in the glycolytic pathway through substrate-level phosphorylation, but it is not directly a product of the oxidation of G3P. ADP is a nucleotide that is involved in ATP synthesis but does not form as a result of electron loss from G3P. Glucose is not produced during this step, as glycolysis starts with glucose and breaks it down into pyruvate, rather than producing glucose itself.

Thus, the correct answer is NADH, which is produced when G3P molecules lose electrons during glycolysis.