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: 2065

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following are least likely to diffuse through the phospholipid bilayer of a cell membrane?

TLS Online TPP Program

#Question id: 2065

#Section 2: General Biology

Which of the following are least likely to diffuse through the phospholipid bilayer of a cell membrane?

TLS Online TPP Program

#Question id: 2066

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following statements describes a characteristic feature of a carrier protein in a plasma membrane?

TLS Online TPP Program

#Question id: 2066

#Section 2: General Biology

Which of the following statements describes a characteristic feature of a carrier protein in a plasma membrane?

TLS Online TPP Program

#Question id: 2067

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following would likely diffuse through the lipid bilayer of a plasma membrane most rapidly?

TLS Online TPP Program

#Question id: 2067

#Section 2: General Biology

Which of the following would likely diffuse through the lipid bilayer of a plasma membrane most rapidly?