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

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

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

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

5. An ion exchange resin is composed of

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