What flavor characteristic does yeast contribute to the overall beer profile?

Yeast plays a crucial role in the fermentation process of beer, where it converts sugars into alcohol and carbon dioxide. This process not only creates alcohol, which contributes to the strength and body of the beer but also generates carbonation, enhancing the mouthfeel and overall drinking experience. The type of yeast used can also influence the specific characteristics of the alcohol profile, potentially leading to distinct flavors or aroma compounds present in the final beer.

Other options, while important in the overall beer profile, do not primarily stem from yeast. Bitterness is mainly derived from hops, sweetness can come from unfermented sugars or malt characteristics, and color is primarily a result of the malts used in brewing rather than the yeast itself. Thus, the contribution of yeast to alcohol and carbonation makes it central to the overall beer profile.