200 Best MCQs on Immobilized enzyme- biochemical engineering
Q17). The intraparticle mass transfer resistance can affect the rate of enzyme reaction, if enzymes are immobilized by
a).copolymerization or microencapsulation
b).crosslinking using multifunctional reagents
c).adsorption
d).all of the above
Correct Answer:
copolymerization or microencapsulation
Explaination:
Q18). The covalent attachment of enzyme molecules is via
a).nonessential amino acids residues to water insoluble, functional supports
b).essential amino acids residues to water insoluble, functional supports
c).nonessential amino acids residues to water soluble, functional supports
d).essential amino acids residues to water soluble, functional supports
Correct Answer:
nonessential amino acids residues to water insoluble, functional supports
Explaination:
Q19). 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
a).reaction rate/rate if not slowed by diffusion
b).rate if not slowed by diffusion/ reaction rate
c).actual reaction rate/ rate if not slowed by diffusion
d).rate if not slowed by diffusion/ actual reaction rate
Correct Answer:
actual reaction rate/ rate if not slowed by diffusion
Explaination:
Q20). 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 co-valently with enzymes
c).Enzymes are cross linked intermolecularly
d).None of the above
Correct Answer:
None of the above
Explaination:
Q21). 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
Correct Answer:
non-covalent bond formation dependent
Explaination:
Q22). Which of the following is the commonly employed adsorbents?
a).Calcium carbonate
b).Alumina
c).Celluloses
d).All of these
Correct Answer:
All of these
Explaination:
Q23). 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
Correct Answer:
a diffusion cell with two compartments divided by a thin gel
Explaination:
Q24). 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
Correct Answer:
increase of diffusivity and decreased with the increase of particle size
Explaination: