Which statement is true about aerobic metabolism location?

• A. It occurs in mitochondria
• B. It occurs in the cytosol
• C. It does not require oxygen
• D. It yields 2 ATP per glucose

Answer: (A)

Aerobic metabolism mainly happens in the mitochondria. In these organelles, the Krebs cycle and the electron transport chain run, with oxygen acting as the final electron acceptor to drive ATP production through oxidative phosphorylation. While glycolysis occurs in the cytosol and can happen without oxygen (yielding a net 2 ATP per glucose), the bulk of ATP from aerobic metabolism comes from mitochondrial processes. That’s why the mitochondria are the key location for aerobic energy generation. The other statements either describe steps outside the main aerobic pathway (glycolysis in the cytosol) or mix in features of anaerobic pathways (no oxygen) or ATP yield from glycolysis, which don’t characterize where aerobic metabolism primarily occurs.