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: 3947

#Section 3: Genetics, Cellular and Molecular Biology

Of the following statements about the aminoacyl tRNA synthetases, which one must be true?

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#Question id: 21126

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

The magnetic biosensors are type of ________________ based sensors?

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#Question id: 1127

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following steps does not occur after acetylcholine binds to the muscarinic acetylcholine receptor in heart muscle cells?

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#Question id: 12735

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

Match the following:

A. Maize                                  i. Modified seed storage protein

B. Tomato                              ii. Modified ripening

C. Canola                                 iii. Resistance to insects

D. Soya Bean                         iv. Seed oil modification

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#Question id: 341

#Section 2: General Biology

 Which force can stabilize a DNA double-helix?