A baffled fermenter with tank diameter and liquid height equal to 1.2 m is stirred using a six-blade downward-pumping impeller. The impeller diameter is 0.42 m and the stirrer speed is 1.5 s. The viscosity of the fermentation broth is 10^-2 Pa s and the density is 1000 kg m-³. Estimate the mixing time under nonaerated conditions.

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#Question id: 3296

#Section 3: Genetics, Cellular and Molecular Biology

Some beetles and flies have antler-like structures on their heads, much like male deer. The existence of antlers in beetle, fly, and deer species with strong male-male competition is an example of

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#Question id: 12904

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

Match the following:

1. Southern Blotting                               i. Melting temperature of DNA strand

2. DNA microchips                                   ii.oligonucleotide matching to DNA sample

3. ASO-PCR                                                 iii.DNA hybridization to oligo arrays

4. DGGE                                                        iv. labeled probe hybridization to DNA  

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#Question id: 194

#Section 2: General Biology

Which does not return to its original form after each catalysis?

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#Question id: 3786

#Section 3: Genetics, Cellular and Molecular Biology

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?

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#Question id: 349

#Section 2: General Biology

Increased atmospheric CO2 concentrations might have what effect on seawater?