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TLS Online TPP Program

#Question id: 14266

For the activated-sludge, the specific growth rate of cells is given by 


 

The following parameter values are known: F = 500 l/h, α = 0.4, ɣ = 0.1, Xe = 0, V = 1500 l, Ks = 10 mg/l, µm = 1 h-1 , kd = 0.05 h^-1 , S0 = 1000 mg/l, Y M X/S = 0.5 g dw/g substrate.. Calculate the cell concentration in the reactor. 

#Section 5: Bioprocess Engineering and Process Biotechnology
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TLS Online TPP Program

#Question id: 3954

#Section 3: Genetics, Cellular and Molecular Biology

Which sequence represents increasing levels of chromosomal organization, from most dispersed to most condensed?
TLS Online TPP Program

#Question id: 3733

#Section 3: Genetics, Cellular and Molecular Biology

The sequence of genes and proteins used in the initiation and termination of DNA replication is
TLS Online TPP Program

#Question id: 14248

#Section 5: Bioprocess Engineering and Process Biotechnology

A steam steriliser is used to sterilise liquid medium for fermentation. The initial concentration of contaminating organisms is 108 per litre. For design purposes, the final acceptable level of contamination is usually taken to be 10-3cells; this corresponds to a risk that one batch in a thousand will remain contaminated even after the sterilisation process is complete. For how long should 1 m3 medium be treated if the temperature is 140⁰C ________________.

        To be safe, assume that the contaminants present are spores of Bacillus stearothermophilus, one of the most heat-resistant microorganisms known. For these spores the activation energy for thermal death is 283 kJ gmo1-1 and the Arrhenius constant is 1036.2 s-1

TLS Online TPP Program

#Question id: 14945

#Section 1: Engineering Mathematics

The general solution of  
TLS Online TPP Program

#Question id: 165

#Section 2: General Biology

Amino acids are ampholytes because they can function as either a(n):