⚗️ Biochemical Engineering Solved MCQs with Answers

Practice 513 approved ⚗️ Biochemical Engineering questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

513 solved MCQs

Bacterial growth curve is obtained by plottingAnswer: Log of number of cells versus time When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.Answer: Permeabilize Heat transfer rates (per unit volume) will be lowest inAnswer: Continuous packed bed reactor The function(s) of the draft tube in an airlift bioreactor isAnswer: All of these The Monod Model relatesAnswer: Specific growth rate to the substrate availability The height to diameter ratio (H/D) for the column fermenters isAnswer: >3 The high oxygen transfer efficiencies of airlift bioreactors is due toAnswer: All of these The maximum specific growth rate (μₘ) of an organism in batch culture is equal to slope of a plot ofAnswer: In [biomass] against time for exponential phase data only The region of an airlift bioreactor in which the liquid travels in a downward direction is called theAnswer: Downcomer Population doubling time, t(d) can be expressed as (where μ is the specific growth rate.)Answer: ln2/μ A higher Kₛ value of Monod's equation meansAnswer: Greater affinities to substrate The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column whichAnswer: Decreases the productivity of the fermenter Which of the following is correct for the prediction of time requirement in a batch fermenter?Answer: Both (a) and (b) In an airlift bioreactor, the spent gases released from the liquid are calledAnswer: Disengagement zone The contents in jet loop reactor are mixed throughAnswer: External pumping The specific growth rate (μ) is defined asAnswer: The rate of individual cells division or increase in their biomass The number of baffles in a standard stirred tank bioreactor isAnswer: 4 In the stationary phaseAnswer: Growth rate is equal to death rate Which of the following is an example of a mathematical model?Answer: All of these Biomass concentrations during fermentation isAnswer: All of these Chemostats work on the principle ofAnswer: Maintaining uniform nutrients concentration During the exponential phase the maximum specific growth rate equals specific growth rate asAnswer: Concentration of growth limiting substrate is much greater than the monod constant During the exponential phase the maximum specific growth rate equals specific growth rate asAnswer: Concentration of growth limiting substrate is much greater than the monod constant Yield coefficient representsAnswer: Conversion efficiency of a substrate into product The lowest biomass yield in a culture of Escherichia coli will be inAnswer: An aerated batch culture containing a initial high concentration of glucose When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out?Answer: Organism maintaining the lowest substrate concentration The continuous cultures are not widely used in industry becauseAnswer: All of these The lowest yield of ATP /is inAnswer: Fermentation Mixing in an anaerobic sludge blanket reactor is due toAnswer: Release of gases by the microbial populations 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 beAnswer: 0 g.l⁻¹h⁻¹