Question

which of the following is not occurring in the krebs cycle?
a. energy transferring to the etc
b. production of some atp
c. oxygen is being released
d. carbon dioxide is being released

Explanation:

To solve this, we analyze each option based on Krebs cycle (Citric Acid Cycle) knowledge:

• Option A: The Krebs cycle produces NADH and FADH₂, which transfer energy to the Electron Transport Chain (ETC) – this occurs.
• Option B: The Krebs cycle produces a small amount of ATP (via substrate - level phosphorylation) – this occurs.
• Option C: The Krebs cycle does not involve oxygen release. Oxygen is used in the ETC (as the final electron acceptor), and the Krebs cycle occurs in the mitochondrial matrix without releasing oxygen.
• Option D: The Krebs cycle releases carbon dioxide as acetyl - CoA is oxidized – this occurs.

Answer:

C. Oxygen is being released