Q. A fed-batch reactor containing 1 g.l­¹ of substrate in 2 litre of medium. It is fed with 1 g.l-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l­¹ . The mass of substrate that was used by the culture in the reactor was

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Q. Toxins accumulated in a reactor can lead to low biomass yields probably due to which of the following?

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Q. The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will

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Q. Fluidized bed bioreactors provide higher mass transfer rates than packed bed bioreactors because

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Q. In fed-batch fermentation, mass of substrate utilized is calculated using the relationship

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Q. Mixing in an anaerobic sludge blanket reactor is due to

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Q. In batch culture, protogon is produced from peptone during the stationary phase with a yield of 0.4 protogon mg per g of peptone. If it is to be produced in a chemostat at a dilution rate of 0.5 h­¹ from a medium containing 10 g.l­¹ of peptone, then the rate of protogon synthesis would be

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Q. Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because

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Q. Which of the following would not be subjected to the "glucose effect"?

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Q. Immobilized cell reactors for wastewater treatment have the advantage of having/being

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Q. Yield coefficient represents

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Q. The lowest biomass yield in a culture of Escherichia coli will be in

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Q. When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out?

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Q. The continuous cultures are not widely used in industry because

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Q. The lowest yield of ATP /is in

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Q. A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be

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Q. Mixing per unit volume is observed to be poorest in

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Q. The growth of an organism on glucose is described by the following Monod model parameters: μm = 0.5 h­¹ and Ks =0.1 g.l­¹, if the concentration of glucose in the feed is 10 g.l­¹ and the dilution rate is set to 0.4 h­¹, then the steady state concentration of glucose in the effluent will be

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Q. A continuous reactor at steady state contains 0.04 g.l­¹ of biomass and 0.02 g.l­¹ of phenol. The feed contained 0.1 g.l­¹ of phenol. The biomass yield would be

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Q. A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.

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