Question

The three stages of cellular respiration are glycolysis, Krebs cycle, and the electron transport chain. When do cells exhibit all these stages?

A.In the absence of oxygen only

B.In the presence as well as in the absence of oxygen

C.In the presence of oxygen only

Answer 1

C. The only way to start respiration is if oxygen is present; Otherwise, it would go through fermentation

Answer 2

the answer should be C