Final answer:
The correct order of glucose catabolism in the presence of oxygen is Glycolysis → Krebs cycle → Electron transport chain, leading to the production of ATP and water. The correct option is A).
Step-by-step explanation:
The correct ordering of events during the catabolism of glucose in the presence of O2 is Glycolysis → Krebs cycle → Electron transport chain. During glycolysis, glucose is split into two pyruvate molecules in the cytoplasm.
These pyruvate molecules are then converted to Acetyl CoA, which enters the Krebs cycle (also known as the citric acid cycle or TCA cycle) in the mitochondrial matrix, where it is further oxidized, producing NADH and FADH2.
Finally, the high-energy electrons from NADH and FADH2 move through the electron transport chain in the inner mitochondrial membrane, driving the production of ATP through a process called oxidative phosphorylation. The end products are water and ATP. Option A) is the correct one.