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TLS Online TPP Program

#Question id: 15618

Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1-, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac-). During an condition  isolate  a second Lac– mutation, which you designate lac2-. Using P1 phage on this strain and use the resulting phage lysate to infect the lac2- strain, selecting for   Kanr   transductants. In this case, all 100   Kanr   transductants that are examined are Lac–. What does this result tell you about the relationship between the lac1- and lac2- mutations?

#SCPH28 | Zoology
  1. lac1- and lac2- mutations are very far from each other, they are linked, and are mutations in two different genes.
  2.  lac1- and lac2- mutations are very far from each other, they are unlinked, and are mutations in same genes.
  3. lac1- and lac2- mutations are linked, and are mutations in same genes.
  4.  lac1- and lac2- mutations are very far from each other, they are unlinked, and are mutations in two different genes.
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TLS Online TPP Program

#Question id: 15623

#SCPH05 I Biotechnology

Under unaerated condition in a fermentor, the power consumed by a single impeller was 10,000 W. The diameter of the impeller D is 1m and the density of the medium is 1000 kg/m3 and the stirrer speed is 1s-1. If one more impeller is added to the fermentor, power consumption would be approximately
TLS Online TPP Program

#Question id: 15624

#SCPH05 I Biotechnology

In heat transfer through a heat exchanger in co- current or counter-current flow, which of the assumptions is not correct ?
TLS Online TPP Program

#Question id: 15625

#SCPH05 I Biotechnology

A stagnant liquid film of 0.4 mm thickness is held between two parallel plates. The top plate is maintained at 400C and the bottom plate is maintained at 300C. If
the thermal conductivity of the liquid is 0.14 W/(m K), then the steady state heat flux ( W/m2) assuming one-dimensional heat transfer is
TLS Online TPP Program

#Question id: 15626

#SCPH05 I Biotechnology

In a mass transfer system the unit of diffusivity is
TLS Online TPP Program

#Question id: 15627

#SCPH05 I Biotechnology

A fermentation medium is being cooled from 700C to 320C in a double pipe heat exchanger. Fluid flowing counter currently with this stream in heated from 200C
to 460C. The log mean temperature difference (in0C) for the two streams is
TLS Online TPP Program

#Question id: 15628

#SCPH05 I Biotechnology

When a liquid of density 1200 kg/m3 and viscosity 0.01 kg m-1s-1 flows through a 1 cm Diameter pipe at 0.2 m/s, the flow is referred as a