- Saccharomyces cerevisiae is a facultative anaerobe capable of converting sugars (like glucose, fructose, and sucrose) into ethanol and carbon dioxide under anaerobic or low-oxygen conditions. - This yeast is widely used in brewing, winemaking, baking, and the production of biofuels (ethanol). - Its efficiency, robustness, and well-understood genetics make it ideal for large-scale industrial fermentation processes.