To make traditional ginger ale, yeast which contains zymase is added with sugar which is the generic name for sweet-tasting soluble carbohydrates.
To make traditional ginger ale, yeast or ginger bug is added to the initial ginger preparation containing sugar and other flavourings. In yeast, the enzyme responsible for fermentation is known as zymase. Sugar is the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food. 
