cellular respiration uses one glucose molecule to produce a total of

Answer 1

The total amount of ATP produced during cellular respiration varies depending on the presence or absence of oxygen.

In the presence of oxygen (aerobic respiration), one glucose molecule can produce a net gain of 36-38 ATP molecules. This includes a yield of 2 ATP molecules from glycolysis, 2 ATP molecules from the Krebs cycle, and approximately 32-34 ATP molecules from oxidative phosphorylation.

In the absence of oxygen (anaerobic respiration or fermentation), one glucose molecule can produce a net gain of only 2 ATP molecules, which is solely from glycolysis.