Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 11119
TLS Online TPP Program

#Question id: 1295

What signal is released by endothelial cells to recruit circulating leukocytes?

#Section 3: Genetics, Cellular and Molecular Biology

  1. Vesicle-sequestered P-selectins are moved to the cell surface.

  2. Vesicle-sequestered αLβ2 molecules are moved to the cell surface.

  3. Integrins are cleaved from the plasma membrane so that the extracellular domain can bind leukocytes.

  4. Secreted glycoproteins trigger leukocytes to initiate “rolling” motility.

More Questions
TLS Online TPP Program

#Question id: 20010

#Section 5: Bioprocess Engineering and Process Biotechnology

In an activated sludge process, the biomass is recycled to
TLS Online TPP Program

#Question id: 20011

#Section 5: Bioprocess Engineering and Process Biotechnology

A strain of Escherichia coli has a maximum specific growth rate of 0.8 h-1 on a glucose based medium. If this organism is being grown in a chemostat with a dilution rate of 1.2 h-1, then at steady state the concentration of E. coli in the same medium will
TLS Online TPP Program

#Question id: 20012

#Section 5: Bioprocess Engineering and Process Biotechnology

A fed-batch reactor containing 2 litre of medium and 0.1 g.l-l of biomass is fed with a medium containing 1 g.l-1 of substrate at 1 litre per hour. If after 10 hours, the concentration of biomass in the reactor was 0.2 g.l-1, then the biomass produced during the 10 hour period is
TLS Online TPP Program

#Question id: 20013

#Section 5: Bioprocess Engineering and Process Biotechnology

In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to
TLS Online TPP Program

#Question id: 20014

#Section 5: Bioprocess Engineering and Process Biotechnology

In plug flow tubular reactor the axial velocity profile on cross-section will be
TLS Online TPP Program

#Question id: 20015

#Section 5: Bioprocess Engineering and Process Biotechnology

The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?