Question 31. Production of organic acids in batch culture is generally growth associated phase followed by non-growth associated production. The probable reason for this is that

Question 32. The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?

Question 33. Pseudo-steady state in a continuous reactor refers to a reactor in which

Question 34. The ideal tubular-flow fermenter without radial variations is called a

Question 35. The toxicity of organic acids to cells

Question 36. The main reason for production of antibiotics in fed batch reactors is

Question 37. Fed batch reactors is used to produce vinegar because

Question 38. When a culture of fermenting yeast becomes metabolically uncoupled, ethanol

Question 39. On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters μm = 0.3 h­¹, Ks =0.05 g.l­¹ and Yxs = 0.3 g.g­¹ When this organism is grown in a 2 litre continuous on a medium containing 10 g.l­¹ of glucose added at 1 l.h­¹, the steady state concentration of biomass in the reactor will be

Question 40. Mixing profiles closest to plug flow are observed in