A yeast cell feeding on glucose suddenly switches from producing carbon dioxide and many ATP molecules to producing ethyl alcohol and few ATP molecules. Which of the following would force yeast to make this change?
o The yeast cell moved from an anaerobic environment to an aerobic environment.
o The yeast cell moved from an aerobic environment to an anaerobic environment.
o The yeast cell switched from feeding on glucose to feeding on lipids.
o The yeast cell switched from feeding on glucose to feeding on proteins