In antibiotic manufacturing processes, the fermentation time ranges from 2-3 wee

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4-5 weeks

2. A stirred tank reactor containing a fluid with a density of 2.5 g.ml^-1 and viscosity of 0.002 kg m^-1s^-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
Options
A. 2500
B. 100
C. 12,50,000
D. 1,000,000

3. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
Options
A. The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
B. When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
C. At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
D. All of the above

4. The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
Options
A. the concentration of lactate in the medium
B. the level of lactate oxidase activity in the medium
C. the level of lactate dehydrogenase activity
D. the level of lactase activity in the medium

6. Chromatography is based on the
Options
A. different rate of movement of the solute in the column
B. separation of one solute from other constituents by being captured on the adsorbent
C. different rate of movement of the solvent in the column
D. any of the above

10. The purity of a solute collected between two times t₁ and t₂ during chromatographic separation can be calculated as
Options
A. amount of solute eluted - amount of impurity eluted
B. amount of solute eluted / amount of impurity eluted
C. amount of solvent eluted + amount of impurity eluted
D. amount of solvent eluted / amount of impurity eluted

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