Question

Which one of the following is used in the manufacture of alcohol?

• A. Bacteria
• B. Water molds
• C. Yeasts
• D. Slime molds

Answer 1

The correct option is C Yeasts

The overall process of fermentation is to convert sugar glucose (C${}_6$H${}_{12}$O${}_6$) to an alcohol (CH${}_3$CH${}_2$OH) and carbon dioxide gas (CO${}_2$). The reactions within the yeast to make this happen are very complex but the overall process is as follows: C${}_6$H${}_{12}$O${}_6$ ====> 2(CH${}_3$CH${}_2$OH) + 2(CO${}_2$)

Sugar ====> Alcohol + Carbon dioxide gas.

The most important type of fermentation is alcoholic fermentation, in which the action of zymase secreted by yeast converts simple sugars, such as glucose and fructose, into ethyl alcohol and carbon dioxide.