The correct option is A 2
Net gain of ATP molecules during glycolysis is 2. In the glycolytic pathway, 4 molecules of ATP are produced. 2 ATP molecules are produced when triose bisphosphate is converted to triose phosphate and the other two are produced when phosphoenolpyruvate is converted to pyruvic acid. Hence, a total of 4 ATP molecules are formed during glycolysis.
2 molecules of ATP are utilised in the glycolysis. One molecule of ATP is utilised when glucose is converted to glucose-6-phosphate and the other is utilised when fructose-6-phosphate is converted to fructose-1,6-bisphosphate. So, the net gain of ATP molecules during glycolysis is 2.