Practice Questions

TLS Online TPP Program

#Question id: 4345

For a repressible operon to be transcribed, which of the following conditions must occur?

#Section 3: Genetics, Cellular and Molecular Biology

A corepressor must be present.
RNA polymerase and the active repressor must be present.
RNA polymerase must bind to the promoter, and the repressor must be inactive.
RNA polymerase must not occupy the promoter, and the repressor must be inactive.

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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^-lof 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?

TLS Online TPP Program

#Question id: 20043

#Section 4: Fundamentals of Biological Engineering

The exponential phase may be described by the equation _______

TLS Online TPP Program

#Question id: 20044

#Section 4: Fundamentals of Biological Engineering

In a batch sterilization process if ∇overall , ∇heating & ∇cooling are 32.2, 9.8 & 10.1 respectively, THEN the holding time at 121ºC of the process is (given that the specific death rate (k) of microorganisms at 121ºC is 2.54 min^-1 ):