Answer:
breaking down of glucose
Explanation:
Glycolysis, formation of acetyl CoA, Krebs cycle and the electron transport chain are all involved in the breaking down of glucose, also known as respiration, in living organisms.
During glycolysis, glucose is transformed into 2 molecules of pyruvate with ATP and NADH being generated in the process.
The pyruvate molecules are each oxidized to acetyl CoA, a process that leads to the release of carbon dioxide and the formation of NADH.
The acetyl CoAs then undergo a series of reactions, combining with a 4-carbon molecule and generating ATP, FADH2, NADH, and releasing carbon dioxide. The 4-C molecule is also regenerated during the process. This is known as the Krebs cycle.
All the FADH2 and NADH made from the earlier steps then enter the electron transport chain where they donate their electrons to become FAD and NAD respectively. ATP is generated and water is formed through the reduction of oxygen.
