11. For glucose isomerization by immobilized enzyme, the reactor generally used is

A. CSTR
B. plug flow
C. packed bed
D. fluidized bed

12. If Damkohler number, N_Da >>1, the reaction rate is much greater than the mass transfer rate and the overall reaction is controlled by the rate of mass transfer. In this case, the enzyme reaction can be described as (where C_sb and C_s are the substrate concentration in bulk of solution and at the immobilized enzyme surface respectively. k_s mass transfer coefficient and a is the surface area of immobilized enzyme particles)

A. r_p = k_sa(C_sb–C_s)
B. r_p= k_saC_sb
C. r_p= k_saC_s
D. r_p= k_sa(C_sb+C_s)

13. The most commonly employed cross-linked polymer is the

A. polyacrylamide gel
B. collagen
C. celluloses
D. cation exchange resin

14. Which of the following is not the correct answer?

A.  Immobilized enzyme may show selectively altered chemical properties
B. Immobilized enzyme may show selectively altered physical properties
C. Immobilized enzyme may simulate the realistic natural environment where the enzyme comes from the cell
D. None of the above

15. Commonly employed water-insoluble supports for the covalent attachment of enzyme include

A. acrylamide based polymers
B. polypeptides
C. dextran
D. all of these