Questions and answers for exam Preparation

MCQs

Total Questions : 54 | Page 5 of 6 pages

Question 41. . Which of the following is not a physical method of immobilization?

Adsorption
Entrapment
Micro encapsulation
None of these

Discuss Question

Answer: Option D. -> None of these

Question 42. . The intraparticle mass transfer resistance can affect the rate of enzyme reaction, if enzymes are immobilized by

copolymerization or microencapsulation
crosslinking using multifunctional reagents
adsorption
all of the above

Discuss Question

Answer: Option A. -> copolymerization or microencapsulation

Question 43. .
The support material for immobilization of cells of Bacillus subtilis is

ion exchange resins
gelatin
Anthracite
agarose and carbodiimide

Discuss Question

Answer: Option D. -> agarose and carbodiimide

Question 44. . The covalent attachment of enzyme molecules is via

nonessential amino acids residues to water insoluble, functional supports
essential amino acids residues to water insoluble, functional supports
nonessential amino acids residues to water soluble, functional supports
essential amino acids residues to water soluble, functional supports

Discuss Question

Answer: Option A. -> nonessential amino acids residues to water insoluble, functional supports

Question 45. . Which is not the method for producing immobilized enzymes with multifunctional reagents?

Enzymes are adsorbed on the surface active support followed by intermolecular cross linking
Functional groups are introduced on the support to react co-valently with enzymes
Enzymes are cross linked intermolecularly
None of the above

Discuss Question

Answer: Option D. -> None of the above

Question 46. .
To measure the extent to which the reaction rate is lowered because of resistance to mass transfer, the effectiveness factor of an immobilized enzyme, η can be defined as

reaction rate/rate if not slowed by diffusion
rate if not slowed by diffusion/ reaction rate
actual reaction rate/ rate if not slowed by diffusion
rate if not slowed by diffusion/ actual reaction rate

Discuss Question

Answer: Option C. -> actual reaction rate/ rate if not slowed by diffusion

Question 47. .
Various techniques are available for determining the effective diffusivity of solute in gel. Thin disk method uses

a diffusion cell with two compartments divided by a thin gel
a diffusion cell with two compartments C. a diffusion cell with two compartments plus by a thin gel
a diffusion cell with two compartments plus by a thin gel
a diffusion cell with two compartments multiply by a thin gel

Discuss Question

Answer: Option A. -> a diffusion cell with two compartments divided by a thin gel

Question 48. . The effectiveness factor increases with the