Saccharomyces cerevisiae and Enterobacter aerogenes are the better known biofuel producing
bacteria. E. aerogenes possesses advantage over S. cerevisiae respect to their ability to produce both
ethanol and hydrogen under anaerobic condition. However, ethanol is produced commercially by S.
cerevisiae because it ferments glucose to ethanol as a virtually sole product and it is known for its high
ethanol tolerance, rapid fermentation rates and insensitivity to temperature and substrate concentration