Nicotiana tabacum cells are cultured to high density for production of polysaccharide gum. The reactor used is a stirred tank, containing initially 100 litres medium. The maximum specific growth rate of the culture is 0.18 d^-1 and the yield of biomass from substrate is 0.5 g g^-l. The concentration of growth-limiting substrate in the medium is 3% (w/v). The reactor is inoculated with 1.5 g l^{- 1} cells and operated in batch until the substrate is virtually exhausted; medium flow is then started at a rate of 4 l d^-1. Fed-batch operation occurs under quasi-steady-state conditions. Estimate the batch culture time.                                  ____________________

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#Question id: 15488

#Section 6: Plant, Animal and Microbial Biotechnology

IMP biosynthetic genes constitute the pur operon and are involved in Purines synthesis. Bacterial strain used for this 

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#Question id: 15900

#Section 6: Plant, Animal and Microbial Biotechnology

During development of a somatic embryo from a single superficial cell of the explant, the cells of this meristematic mass continue to divide to give rise to the various stages of SEs. Which of the following is considered correct for the development of SEs?

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#Question id: 27914

#Section 5: Bioprocess Engineering and Process Biotechnology

For scaling up of a bioreactor for the aerobic fermentation process, the following parameter may be assumed to be constant

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#Question id: 1975

#Section 2: General Biology

Which of the following differentiates T cells and B cells?

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#Question id: 3258

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following incorrect about genetic drift