Question

Kreb's cycle is termed as the aerobic phase of respiration because
A) It consumes oxygen
B) Oxygen acts as a catalyst
C) Aerobic conditions are essential for the continued operation of electron transport system
D) All the above

Answer 1

The answer will be d

Answer 2

Answer:

The correct answer is that the aerobic conditions are essential for the continued operation of the electron transport system and the correct option is C)

Explanation:

• The Krebs cycle takes place within the matrix of mitochondria in eukaryotes. The net result of the Kreb cycle is that, for each acetyl group entering the cycle as acetyl-CoA, two molecules of CO₂ are produced. The large amount of free energy released during the oxidation of glucose to CO₂ is retained in the reduced coenzymes NADH and FADH₂, generated during the glycolysis and the TCA (Krebs cycle) cycle.  
• Oxygen is essential for the electron transport chain. Electrons are transferred from NADH and FADH₂ to O₂ through a series of electron carriers present on the inner mitochondrial membrane.
• If the oxygen is not present, then there will be no oxidation of NADH and FADH₂. So to maintain continuity, oxygen is required. So, we can say that the Krebs cycle is the aerobic phase of respiration.