**Question 2**The net yield of ATP from the complete oxidation of 3 molecules of glucose is - a) 36 - b) 72 - c) 90 - d) 108 Option c) 90 is selected.

Introduction: Glucose is a simple sugar that is the source of energy in the living body. It contains six carbon atom and an aldehyde group that's why also known as an aldohexose.Explanation: As 36ATP is generated in one complete oxidation of glucose, therefore, 108ATP will be generated by 3 molecules of glucose after complete oxidation. When a molecule of glucose (6 carbon) undergoes glycolysis, 2 molecules of pyruvate or lactate (3 carbon) are produced. Pyruvate is oxidatively decarboxylated to acetyl CoA (2 carbon) which enters the citric acid cycle and gets completely oxidized to CO2 and H2O. The overall process of glucose is completely oxidized to CO2 and H2O via glycolysis and the TCA cycle is as follows: C6H12O6+ 6O2+ 38ADP+ 38Pi → 6CO2+ 6H2O+ 38ATP Since 2ATP used during the transport of NADH + H+ formed by glycolysis from the cytoplasm through the inner membrane of mitochondria, the total ATP generate is equal to 36 in one complete oxidation of glucose.Answer: The net yield of ATP after complete oxidation of 3 molecules of glucose is equal to 108. So, the correct option is "D".