Question

which process occurs just prior to fermentation when oxygen is limited?
○ citric acid cycle
○ electron transport
○ glycolysis
○ photosynthesis

Explanation:

Fermentation occurs under limited oxygen to regenerate NAD⁺ for glycolysis. Glycolysis breaks down glucose into pyruvate, producing NADH. Without oxygen, fermentation uses pyruvate to oxidize NADH back to NAD⁺, allowing glycolysis to continue. The citric acid cycle and electron transport require oxygen, so they do not precede fermentation in anaerobic conditions. Photosynthesis is unrelated to fermentation. Thus, glycolysis is the process just prior to fermentation.

Answer:

glycolysis