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...anaerobic. ATP is called as a "Universal energy currency" since all the energy transactions of the cell use this molecule.
In terms of efficiency, aerobic respiration is more efficient than the anaerobic respiration which yields only two molecules of ATP. Both these modes of respiration share the initial Glycolysis step, which occurs in cytoplasm. After, the glycolysis, other reactions of the aerobic respiration, Krebs (Citric acid cycle) and oxidative phosphorylation takes place in mitochondria.
While the Krebs... Cellular respiration After three steps during respiration, a molecule of glucose and 6 molecules of oxygen are converted to 6 molecules of carbon dioxide, water and energy (Rich, PR, 2003)...