Cicerone Certified Beer Server Practice Exam

What role does yeast play in the brewing process?

1. It contributes hops aroma

2. It enhances beer clarity

3. It ferments sugars into alcohol and carbon dioxide

4. It provides bitterness to the beer

The correct answer is: It ferments sugars into alcohol and carbon dioxide

Yeast plays a crucial role in the brewing process by fermenting sugars into alcohol and carbon dioxide. This fermentation is essential for the production of beer, as it converts the sugars extracted from malted grains into ethanol, which is the primary alcohol in beer. The carbon dioxide produced during fermentation contributes to the carbonation of the beer, giving it that characteristic fizziness and mouthfeel. In addition to producing alcohol and carbonation, yeast can also impart unique flavors and aromas to the beer, depending on the yeast strain used. Different strains can produce esters and phenols that add complexity to the beer's flavor profile. This fermentation process is fundamental to creating the variety of beer styles available, from lagers to ales. While hops are responsible for bitterness and aroma, and various factors can influence clarity, none of these aspects directly relate to the primary function of yeast within a brewing context. Hence, the significance of yeast in turning sugars into alcohol and carbon dioxide is paramount in the overall brewing process.