#Question id: 3949
#Section 3: Genetics, Cellular and Molecular Biology
Which of the following observations supports the view that ribosomal RNA has catalytic activity?
#Question id: 429
#Section 4: Fundamentals of Biological Engineering
An organism that uses organic molecules as carbon sources and obtains energy by oxidizing inorganic molecules is a(an) ________.
#Question id: 1908
#Section 2: General Biology
The very rapid response to a second allogeneic graft is:
#Question id: 1672
#Section 2: General Biology
Using only random VDJ recombination, from 40 V, 23 D, and 6 J gene segments, what are the number of possible variable regions of an antigen receptor molecule?
#Question id: 14239
#Section 5: Bioprocess Engineering and Process Biotechnology
A 200-1itre stirred fermenter contains a batch culture of
Bacillus subtilis bacteria at 28⁰C Air at 20⁰C is pumped into the vessel at
a rate of 1 vvm; (vvm stands for volume of gas per volume of liquid per
minute). The average pressure in the fermenter is 1 atm. The volumetric flow
rate of off-gas from the fermenter is measured as 189 l min-1. The
exit gas stream is analysed for oxygen and is found to contain 20.1% 02.
The dissolved-oxygen concentration in the broth is measured using an oxygen
electrode as 52% air saturation. The solubility of oxygen in the fermentation
broth at 28⁰C
and 1 atm air pressure is 7.8 x 10-3 kg m-3. Calculate
the oxygen transfer rate_____________