21. Which is not the method for producing immobilized enzymes with multifunctional reagents?
A. Enzymes are adsorbed on the surface-active support followed by intermolecular cross-linking
B. Functional groups are introduced on the support to react covalently with enzymes
C. Enzymes are cross-linked intermolecularly
D. None of the above
22. The immobilization technique involving physical method is
A. covalent bond formation dependent
B. non-covalent bond formation dependent
C. both (a) and (b)
D. ionic bond formation dependent
23. Which of the following is the commonly employed adsorbents?
A. Calcium carbonate
B. Alumina
C. Celluloses
D. All of these
24. Various techniques are available for determining the effective diffusivity of solute in gel. Thin disk method uses
A. a diffusion cell with two compartments divided by a thin gel
B. a diffusion cell with two compartments
C. a diffusion cell with two compartments plus by a thin gel
D. a diffusion cell with two compartments multiply by a thin gel
25. The effectiveness factor increases with the
A. increase of diffusivity and decreased with the increase of particle size
B. increase of diffusivity and increased with the increase of particle size
C. decrease of diffusivity and decreased with the increase of particle size
D. increase of diffusivity and decrease with the decrease of particle size