When a cell is metabolizing in the absence of oxygen and it is then exposed to an environment containing oxygen, a series of oxidation"reduction reactions is initiated, which enables the cell to increase its activities.
(a) Outline the oxidation"reduction reactions that are initiated under these conditions and indicate the point at which molecular oxygen interacts with the oxidative system.
(b) Explain how the cell derives additional energy by switching from non" oxidative to oxidative metabolism.