In a fluidized-bed biofilm reactor, cells are attached on spherical plastic particles to form biofilms of average thickness L = 0.5 mm. The bed is used to remove carbon compounds from a waste-water stream. The feed flow rate and concentration of total fermentable carbon compounds in the feed are F = 2 l/h and S = 2000 mg/l. The diameter of the column is 10 cm. The kinetic constants of the microbial population are r_m = 50 mg S/cm³. h and K_S = 25 mg S/cm³ . The specific surface area of the biofilm in the reactor is 2.5 cm² /cm³ . Assuming first-order reaction kinetics and an average effectiveness factor of n = 0.7 throughout the column, determine the required height of the column for effluent total carbon concentration of S_0i = 100 mg/l.

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#Question id: 14173

#Section 5: Bioprocess Engineering and Process Biotechnology

The growth of baker’s yeast (S. cerevisiae) on glucose may be simply described by the following equation:

In a batch reactor of volume 10^5 l, the final desired yeast concentration is 50 gdw/l. Using the above reaction stoichiometry. Determine the yield coefficient YX/O2 (biomass/oxygen)?

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#Question id: 19145

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

TBLASTN is used to 

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#Question id: 597

#Section 2: General Biology

The Km values for enzyme reactions such as A + B → C + D

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#Question id: 15998

#Section 6: Plant, Animal and Microbial Biotechnology

For culturing, plasma from the adult chicken is preferred to mammalian plasma because

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#Question id: 3565

#Section 3: Genetics, Cellular and Molecular Biology

Mendel crossed yellow-seeded and green-seeded pea plants and then allowed the offspring to self-pollinate to produce an F2 generation. The results were as follows: 6,022 yellow and 2,001 green. Which of the following statements correctly describes the relationship of the allele for green seeds to the allele for yellow seeds?