Cellular respiration

A yeast cell is transported from an environment with oxygen to a completely oxygen-free environment.

Which of the following answer choices best describes the metabolic changes that will occur in the yeast cell?

(Choice A)
Glycolysis will still occur and pyruvate will undergo alcohol fermentation, but the Krebs cycle and oxidative phosphorylation will not occur.
(Choice B)
Glycolysis will not occur and pyruvate will not form, causing the yeast cell to undergo alcohol fermentation.
(Choice C)
Glycolysis will still occur, but pyruvate will not form, causing the yeast cell to undergo alcohol fermentation.
(Choice D)
Glycolysis will still occur, pyruvate will still form, causing the yeast cell to undergo lactic acid fermentation.

High school biology