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You Are On Multi Choice Question Bank SET 127

6351. The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of





6352. At the end of the lag phase, when growth begins, the division rate increases gradually and reaches a maximum value in the exponential growth period. This transitional period is commonly called the accelerated growth phase and is often included as a part of the





6353. Which of the following(s) is/are considered the limitations of the exponential growth model?





6354. To describe components of an airlift bioreactor which of the follow-ings are generally included?





6355. The function of the disengagement zone in an airlift fermenter is to





6356. Stationary phase is described as





6357. In the accelerated phase, cell starts to





6358. The monod model predicts that the specific growth rate





6359. A mixed fermentation is one, which produces





6360. She is very beautiful, ...............





6361. The function of the DOS command and DIR/OD/S is :





6362. GUI stands for :





6363. One who can use both hands equally well





6364. If I..............more free time, I would learn Italian.





6365. Mixing in an anaerobic sludge blanket reactor is due to





6366. 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 h-1 from a medium containing 10 g.l-1 of peptone, then the rate of protogon synthesis would be





6367. Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because





6368. Which of the following would not be subjected to the "glucose effect"?





6369. Immobilized cell reactors for wastewater treatment have the advantage of having/being





6370. Which of the statement is true for continuous reactor at steady state?





6371. A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called





6372. For organisms growing in a chemostat, the specific growth rate





6373. Saccharomyces cerevisiae is being grown in a chemostat converts glucose to biomass, ethanol, glycerol and carbon dioxide. At steady state, the concentration of glucose, biomass, ethanol and glycerol will





6374. In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?





6375. A continuous reactor has a dilution rate of 0.5 h-1. Its residence time would be





6376. Which of the following is used to calculate mass of substrate in the reactor?





6377. If biomass yields are constant, then the biomass productivity of a culture grown in continuous reactor will





6378. Low dissolved oxygen concentrations leads to





6379. In a continuous reactor, the medium contains 40 g.l-1 of maltose and the medium flow rate is 10 litres per hour and the effluent contains 20 g.l-l of lactate. What is the productivity of lactate production from this reactor?





6380. A fed-batch reactor containing 1 g.l-1 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.l-1 . The mass of substrate that was used by the culture in the reactor was





6381. Toxins accumulated in a reactor can lead to low biomass yields probably due to which of the following?





6382. 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





6383. Fluidized bed bioreactors provide higher mass transfer rates than packed bed bioreactors because





6384. In fed-batch fermentation, mass of substrate utilized is calculated using the relationship





6385. 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





6386. Mixing per unit volume is observed to be poorest in





6387. The growth of an organism on glucose is described by the following Monod model parameters: μm = 0.5 h-1 and Ks =0.1 g.l-1, if the concentration of glucose in the feed is 10 g.l-1 and the dilution rate is set to 0.4 h-1, then the steady state concentration of glucose in the effluent will be





6388. A continuous reactor at steady state contains 0.04 g.l-1 of biomass and 0.02 g.l-1 of phenol. The feed contained 0.1 g.l-1 of phenol. The biomass yield would be





6389. A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.





6390. The main reason for production of antibiotics in fed batch reactors is





6391. Fed batch reactors is used to produce vinegar because





6392. When a culture of fermenting yeast becomes metabolically uncoupled, ethanol





6393. Mixing profiles closest to plug flow are observed in





6394. On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters μm = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be





6395. Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is





6396. A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be





6397. A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic





6398. In a fluidized bed reactor, the function of the disengagement zone is to





6399. Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?





6400. In a glucose-yeast extract medium, Lactococcus lactis has a maximum specific growth rate (um) of 1.23 h-1. What would be the specific growth rate of this organism at steady state in a 4 litre reactor being fed at 2 litres per hour?





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