For glycolysis to produce atp when no oxygen is present, it is necessary for cells to convert to
a. atp to nad+
b. atp to adp
c. nadh to atp
d. nadh to nad+

The answer is D. NADH to NAD+

When no oxygen is present, anaerobic respiration occurs.It is the only way to produce ATP in this condition.NAD+ is necessary because it is converted into NADH and at the same time ADP is converted to ATP in the reaction of pyruvate synthesis from glucose.Therefore, NADH must be converted to NAD+ in order to have NAD+ always present in the cell.