AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Results of Glycolysis The energy to split glucose is provided by two molecules of ATP. As glycolysis proceeds, energy is released, and the energy is used to make four molecules of ATP. As a result, there is a net gain of two ATP molecules during glycolysis.

Detailed explanation-3: -In the entire process of glycolysis, 2 NADPH molecules also formed. Each NADH produces 3ATP molecules that mean 6 ATP molecules in glycolysis are produced via NADPH. Therefore the total ATP molecules formed are 10ATP as 2ATPs used up in the initial steps, the net gain is 8 ATP molecules. So, the correct answer is ‘8’.

Detailed explanation-4: -There is a net gain of 2 ATP as a result of glycolysis. The reason for this is because the first part of glycolysis requires an input of 2 ATP. The second part of glycolysis produces 4 ATP.

Detailed explanation-5: -Thus, two ATPs are used in the first three steps of glycolysis. Hence, to split the glucose 2 molecules of ATPs are used.