Final answer:
Yeast cells grown anaerobically obtain energy through alcoholic fermentation, resulting in the production of ATP, CO2, and ethanol.
Step-by-step explanation:
Yeast cells grown anaerobically obtain energy through fermentation, specifically alcoholic fermentation. During alcoholic fermentation, pyruvate produced through glycolysis is converted into ethanol and carbon dioxide by the yeast cells. This process also regenerates NAD+ from NADH, allowing glycolysis to continue producing ATP. Therefore, the products of fermentation in yeast cells grown anaerobically are ATP, CO2, and ethanol.