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1. An internal draft tube is preferred to an external draft tube because
A. it is easier to clean and sterilize a reactor
B. it is cheaper to build a reactor with an internal draft tube
C. Both (a) and (b)
D. none of the above
2. A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in
A. 1958
B. 1946
C. 1942
D. 1950
3. The optical density sometimes drops during the lag phase because
A. cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
B. of fast cell growth causing them to fill up with DNA
C. cells swell up with water
D. cells swell up with RNA
4. The application of just in time (JIT) manufacturing techniques in biotechnology is important because
A. raw materials used in biotechnology are biodegradable
B. the products of biotechnology are biodegradable
C. it is a very competitive business (d) all of the above
D. all of the above
5. Residence time distribution (RTD) of a reactor is independent of
A. micromixing
B. volume of reactor
C. height of the reactor
D. width of the reactor
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