Two continuous bioreactors containing the same organisms, fed with the same feed at the same dilution rate were compared. Reactor 1 started with an initial concentration of glucose of 10 g.l-1, while reactor 2 contained 0.1 g.l-1 of glucose at the start of the process then at steady state

• the concentration of glucose in reactor 1 would be greater than that in reactor 2
• the concentration of glucose in reactor 1 would be equal to reactor 2
• the concentration of glucose in reactor 1 would always be zero.
• the concentration of glucose in reactor 1 would be less than that in reactor 2