Final answer:
The reactants glucose and oxygen must be available in the cell for ten NADH molecules to be produced during cellular respiration.
Step-by-step explanation:
In order for ten NADH molecules to be produced during cellular respiration, the reactants glucose and oxygen must be available in the cell. Glucose is initially broken down through a process called glycolysis, which produces 2 NADH molecules. The remaining steps of cellular respiration, including the citric acid cycle and oxidative phosphorylation, generate additional NADH molecules. These reactions require oxygen to be present, as it serves as the final electron acceptor in the electron transport chain.