Concept:Zymase is the enzyme found in yeast that converts glucose into ethanol and carbon dioxide.Explanation:During fermentation, glucose is broken down anaerobically by zymase.The chemical equation for the process is:C6H12O6zymase2C2H5OH+2CO2Maltase acts on maltose, diastase acts on starch, and invertase acts on sucrose.Only zymase directly ferments glucose to ethyl alcohol.Answer:B. Zymase