TLS Online TPP Program

#Question id: 5425


Two varieties of maize averaging 50 and 20 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 35 inches in height. Out Of the 16 F2 plants, the 5 are 35 inches. What is the probable number of independent segregating polygenes involved in this trait?

#Part-A Aptitude & General Biotechnology
  1. Two     

  2. Eight             

  3. Sixteen.       

  4. Six

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TLS Online TPP Program

#Question id: 14332

#Part-B Specialized Branches in Biotechnology

To ensure turbulent conditions and minimum mixing time during agitation with a turbine impeller, the Reynolds number must be at least 104. A stirred laboratory-scale fermenter with a turbine impeller 5 cm in diameter is operated at 800 rpm. If the density of broth being stirred is close to that of water. The mixing system is scaled up so the tank and impeller are 15 times the diameter of the laboratory equipment. The stirrer in the large vessel is operated so that the stirrer tip speed (tip speed = π N i D i) is the same as in the laboratory apparatus. How does scale-up affect the maximum viscosity. 

TLS Online TPP Program

#Question id: 14333

#Part-B Specialized Branches in Biotechnology

A cylindrical bioreactor of diameter 3 m has four baffles. A Rushton turbine mounted in the reactor has a diameter one third the tank diameter and is operated at a speed of 90 rpm. The density of the fluid is approximately I g cm-3. The reactor is used to culture an anaerobic organism that does not require gas sparging. The broth can be assumed Newtonian. As the cells grow, the viscosity of the broth increases. when the viscosity is 1000 times greater than water, estimate the power required to achieve turbulence.

TLS Online TPP Program

#Question id: 14334

#Part-B Specialized Branches in Biotechnology

Laboratory-scale fermenters are usually mixed using small stirrers with electric motors rated between 100 and 500 W. One such motor is used to drive a 7cm turbine impeller in a small reactor containing fluid with the properties of water. The stirrer speed is 900 rpm. Estimate the power requirements for this process.

TLS Online TPP Program

#Question id: 14336

#Part-B Specialized Branches in Biotechnology

A cylindrical stirred bioreactor of diameter and height 2 m has a Rushton turbine one-third the tank diameter in size. The bioreactor contains Newtonian culture broth with the same density as water and with viscosity 4 cP. The tank is now aerated. In the presence of gas bubbles, the approximate relationship between ungassed power number (NP)0 and gassed power number (NP)g is: (NP)g =0.5 (NP)0. What maximum stirrer speed is now possible in the sparged reactor? Estimate the mixing time.

TLS Online TPP Program

#Question id: 14338

#Part-B Specialized Branches in Biotechnology

Quasi steady state condition is 

TLS Online TPP Program

#Question id: 14340

#Part-B Specialized Branches in Biotechnology

Which bioreactor consists of a multi-layered bag instead of vessel