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. Fed-batch operation is carried out for 40 d. What is the final mass of cells in the reactor?

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#Question id: 5691

#SCPH28 | Zoology

Which of the following most accurately explains the cause for the abnormal numbers of chromosomes during human reproduction that can result in Down syndrome, Turner’s syndrome, or Klinefelter’s syndrome?

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#Question id: 564

#SCPH05 I Biotechnology

A good transition-state analog:

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#Question id: 11955

#I Life Science/ Life Sciences Group – I-V

The process of obtaining food is known as ________ and requires specialized feeding mechanisms.

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#Question id: 10986

#I Life Science/ Life Sciences Group – I-V

Which of the following conditions at the A-V node will cause a decrease in heart rate?

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#Question id: 10289

#SCPH05 I Biotechnology

If C6 of glucose is radiolabelled, which carbon of Dihydroxyacetone phosphate and glyceraldehyde 3-phosphate  is radiolabelled?