Practice Questions

TLS Online TPP Program

#Question id: 14300

A 15-m³ chemostat is operated with dilution rate 0.1 h^-1. A continuous steriliser with steam injection and flash cooling delivers sterilized medium to the fermenter. Medium in the holding section of the steriliser is maintained at 130⁰C The concentration of contaminants in the raw medium is 10⁵ ml^-l; an acceptable contamination risk is one organism every 3 months. The Arrhenius constant and activation energy for thermal death are estimated to be 7.5 × 10³⁹ h^-1 and 288.5 kJ gmol^{- 1}, respectively. The steriliser pipe inner diameter is 12 cm. At 130⁰C the liquid density is 1000 kg m^{- 3} and the viscosity is 4 kg m^{- 1} h^{- 1}. Assuming perfect plug flow, determine the length of the holding section. __________________

#Section 5: Bioprocess Engineering and Process Biotechnology

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#Question id: 1272

#Section 3: Genetics, Cellular and Molecular Biology

Collagen is exported from the endoplasmic reticulum as

#Question id: 15688

#Section 1: Engineering Mathematics

#Question id: 3713

#Section 3: Genetics, Cellular and Molecular Biology

At the normal rate of replication, about how many minutes does it take for the entire E. coli chromosome (4.6 × 10^3 kbp) to be duplicated?

#Question id: 422

#Section 4: Fundamentals of Biological Engineering

The flow of material through a reaction pathway usually depends on ________.

#Question id: 7497

#General Aptitude