Impeller of diameter 0.25 m with stirrer speed of 1 s-¹ is used in 2 m³ baffled bioreactor for the mixing purpose of the medium. The mixing time is equal to (assuming medium viscosity = 0.01 Pa s and density = 1000 kg m^-1)

#Question id: 14244

#Section 5: Bioprocess Engineering and Process Biotechnology

Ethanol is produced by anaerobic fermentation of glucose by Saccharomyces cerevisiae. For the particular strain of S. cerevisiae employed, the maintenance coefficient is 0.18 kg kg^{- 1} h^{- 1}, Yxs is 0.11 kg kg^-1, Y_PX is 3.9 kg kg^-1 and µ_max is 0.4 h^-1.  It is decided to investigate the possibility of using Zymomonas mobilis bacteria instead of yeast for making ethanol. Z. mobilis is known to produce ethanol under anaerobic conditions using a different metabolic pathway to that employed by yeast. Typical values of Yxs are lower than for yeast at about 0.06 kg kg^-1; on the other hand, the maintenance coefficient is higher at 2.2 kg kg ^-1 h ^-1. Ypx for Z. mobilis is 7.7 kg kg^-l; µ_max is 0.3 h- 1.  From stoichiometry, what is the maximum theoretical yield of ethanol from glucose                 

#Question id: 16849

#General Aptitude

#Question id: 17822

#Section 1: Engineering Mathematics

#Question id: 4849

#Section 3: Genetics, Cellular and Molecular Biology

When F1generation of a dihybrid is allowed to test cross, the expected ratio is of genotype when complete linkage?

#Question id: 424

#Section 4: Fundamentals of Biological Engineering

Phosphorylation at the expense of ATP is catalyzed by ________.