Question

nadh or nad+
pyruvate
oxygen
sugars
glycolysis
multiple choice
fermentation in yeast can occur without

Explanation:

Fermentation is an anaerobic process. Glycolysis is the first step in both aerobic and anaerobic respiration. Fermentation occurs after glycolysis when oxygen is not available. NADH is involved in the process of fermentation for the regeneration of NAD+. Pyruvate is the end - product of glycolysis and is further metabolized in fermentation. Sugars are the starting materials for glycolysis (and thus for fermentation as it is a continuation of the pathway when oxygen is absent). But the key factor that fermentation can occur without is oxygen. Aerobic respiration requires oxygen, while fermentation (anaerobic) does not.

Answer:

oxygen