1. Filamentous Saccharopolyspora erythraea bacteria are grown in medium containing glucose as the carbon source, ammonia as the nitrogen source, and sulfate as the sulfur source. No major products other than biomass are produced during cell growth. Sulfur is included easily in the stoichiometric equation if we use sulfuric acid to represent the sulfur source and define the valence of S as +6. The molecular formula for S. erythraea biomass is found to be 1.730.520.170.0032 and the biomass yield from glucose is 0.29 g g-1 .

a) What are the oxygen requirements for this culture?

b) If the medium contains 20 g/L glucose and the culture proceeds until all the glucose is consumed, what minimum concentration (in M) of sulfate must also be included in the medium?