4.21 Ethanol production by yeast and bacteria Both Saccharomyces cerevisiae yeast and Zymomonas mobilis bacteria produce ethanol from glucose under anaerobic conditions without external electron acceptors. The biomass yield from glucose is 0.11 g g21 for yeast and 0.05 g g21 for Z. mobilis. In both cases the nitrogen source is NH3. Both cell compositions are represented by the formula CH1.8O0.5N0.2. (a) What is the yield of ethanol from glucose in both cases