What would be the limiting factor for ATP production by glycolysis in a strenuously exercising muscle that lacks lactate dehydrogenase? a. increased acidity from lactic acid, causing muscle damage b. the supply of NAD + c. the supply of ADP e. the supply of pyruvate

The correct answer is option b. "the supply of NAD+".

Explanation:

Regarding cell's culture, a limiting factor is defined as an element added to the system who is essential for the proper growth of the cells or in the production of the element of interest. Even a small change in a limiting factor would cause a notorious effect in the cell's culture. In this case, a strenuously exercising muscle that lacks lactate dehydrogenase is being cultured. Given that lactate dehydrogenase is the enzyme that converts NAD + to NADH and back, the limiting factor in the culture of the muscle is the supply of NAD + because the culture lacks of the enzyme that produces it.