Downstream Processing – Section 1

1. Concentration polarization can be reduced further by

A. pre-filtering the solution
B. reducing the flow rate per unit membrane surface area
C. back washing periodically
D. all of the above

Correct Answer: D. all of the above

2. A system which requires less solvent and produces a more concentrated extract phase is desired with a

A. large distribution coefficients
B. small distribution coefficients
C. very small distribution coefficients
D. constant distribution coefficients

Correct Answer: A. large distribution coefficients

3. The efficiency of cell disruption in a bead mill depends on the

A. concentration of the cells
B. amount and size of beads
C. type and rotational speed of agitation
D. all of these

Correct Answer: D. all of these

4. A common filter medium is the cloth filter generally made of

A. canvas
B. synthetic fabrics
C. metal or glass fiber
D. all of these

Correct Answer: D. all of these

5. An ion exchange resin is composed of

A. polymeric network
B. ionic functional groups
C. counter ions
D. all of these

Correct Answer: D. all of these

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