Question

which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
the citric acid cycle
the electron transport chain
glycolysis
reduction of pyruvate to lactate

Explanation:

Glycolysis is the initial step in both fermentation and cellular respiration. It occurs in the cytoplasm and breaks down glucose into pyruvate, generating a small amount of ATP and NADH. The citric acid cycle and electron transport chain are part of aerobic cellular respiration only. The reduction of pyruvate to lactate is specific to lactic acid fermentation.

Answer:

glycolysis