A waste-water stream of F = 1 m3 /h with substrate at 2000 mg/l is treated in an upflow packed bed containing immobilized bacteria in form of biofilm on small ceramic particles. The effluent substrate level is desired to be 30 mg/l. The rate of substrate removal is given by the following equation

                   

By using the following information, determine the required height of the column (H). k = 0.5 h-1, X = 10 g/l, Ks = 200 mg/l, L = 0.2 mm, α = 100 m2 /m3 , A = 4 m2 , η = 0.8

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#Question id: 1671

#Section 2: General Biology

A chromosome on which T-cell receptor α chain gene rearrangement has occurred lacks which of the following gene segments?

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#Question id: 236

#Section 2: General Biology

Which are common protein coenzymes?

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#Question id: 14326

#Section 5: Bioprocess Engineering and Process Biotechnology

The chemical reaction equation for conversion of ethanol (C₂H₆0) to acetic acid (C₂H₄0₂) is:

Acetic acid is produced from ethanol during growth of Acetobacter aceti, which has the composition CH_1.80_0.5N_0.2. Biomass yield from substrate is 0.14 g g^{- 1}; product yield from substrate is 0.92 g g^-1. Ammonia is used as nitrogen source. How much gmol of oxygen is demanded for acetic acid production?

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#Question id: 4345

#Section 3: Genetics, Cellular and Molecular Biology

For a repressible operon to be transcribed, which of the following conditions must occur?

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#Question id: 16021

#Section 6: Plant, Animal and Microbial Biotechnology

How does CO2 help in the cell metabolism during cell culture?