An industrial waste-water stream is fed to a stirred-tank reactor continuously and the cells are recycled back to the reactor from the bottom of the sedimentation tank placed after the reactor. The following are given for the system: F = 100 l/h; S0 = 5000 mg/l; mm = 0.25 h-1 ; Ks = 200 mg/l; α (recycle ratio) = 0.6; C (cell concentration factor) = 2; Y ^M _X/S = 0.4. The effluent concentration is desired to be 100 mg/l.  Determine the cell concentration in the reactor and in the recycle stream.

_____________

TLS Online TPP Program

#Question id: 13066

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

Precision will be reduced, but yield will be increased Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.

Which of the following is a codominant marker?

TLS Online TPP Program

#Question id: 13067

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

The first immunoassay formats described were methods based on the ____ reaction, which is characterised either by gel formation in a liquid phase or as an opaque band in an agar plate assay.

TLS Online TPP Program

#Question id: 13068

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

Coating antibody; which actively traps antigen

TLS Online TPP Program

#Question id: 13069

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

A negative agglutination test may NOT indicate the

TLS Online TPP Program

#Question id: 13070

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

Antibodies raised against an antigen from one organism will react to a greater or lesser degree with similar antigens from a related organism, depending on how many surface epitopes they share. This has given rise to a systematic method of identification of microorganisms known as______?

TLS Online TPP Program

#Question id: 13071

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

Modifications of the agglutination reaction involve the use of ________particles, which allow the reaction to be observed more easily in the liquid phase