Question is ⇒ For glucose isomerization by immobilized enzyme, the reactor generally used is, Options are ⇒ (A) CSTR, (B) plug flow, (C) packed bed, (D) fluidized bed, (E) , Leave your comments or Download question paper.

Question is ⇒ For glucose isomerization by immobilized enzyme, the reactor generally used is, Options are ⇒ (A) CSTR, (B) plug flow, (C) packed bed, (D) fluidized bed, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	For glucose isomerization by immobilized enzyme, the reactor generally used is
A.	CSTR [Wrong Answer]
B.	plug flow [Wrong Answer]
C.	packed bed [Correct Answer]
D.	fluidized bed [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Functional groups of the nonessential amino acid residues that are suitable for the immobilization process are
free α-, β- or γ carb oxyl groups
α or β amino groups
phenyl, hydroxyl, sulfhydryl or imidazole groups
all of the above

⇒ The immobilization technique involving physical method is
covalent bond formation dependent
non-covalent bond formation dependent
both (a) and (b)
ionic bond formation dependent

⇒ Which of the following is taken as an assumption in the distributed model?
The reaction occurs at every position and the kinetics of the reaction are of the same form as observed for free enzyme.
Mass transfer through the immobilized enzyme occurs via molecular diffusion
There is no mass transfer limitation at the outside surface of the spherical immobilized enzyme
All of the above

⇒ Which of the following is not the correct answer?
Immobilized enzyme may show selectively altered chemical properties
Immobilized enzyme may show selectively altered physical properties
Immobilized enzyme may simulate the realistic natural environment where the enzyme come from the cell
None of the above

⇒ Which of the following is the commonly employed adsorbents?
Calcium carbonate
Alumina
Celluloses
All of these

⇒ 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

⇒ Damkohler number(N_Da) is
the ratio of the maximum reaction rate to the maximum mass transfer rate
the ratio of the minimum reaction rate to the maximum mass transfer rate
the ratio of the maximum reaction rate to the minimum mass transfer rate
the ratio of the minimum reaction rate to the minimum mass transfer rate

⇒ The effectiveness factor increases with the
increase of diffusivity and decreased with the increase of particle size
increase of diffusivity and increased with the increase of particle size
decrease of diffusivity and decreased with the increase of particle size
increase of diffusivity and decrease with the decrease of particle size

⇒ 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 an immobilized enzyme particles)
r_p = k_sa(C_sb-C_s)
r_p = k_saC_sb
r_p = k_saC_s
r_p = k_sa(C_sb+C_s)

⇒ The most commonly employed cross-linked polymer is the
polyacrylamide gel
collagen
celluloses
cation exchange resin

⇒ 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

⇒ The immobilized enzyme produced by micro encapsulation technique provides
an extremely large surface area
smaller surface area
high amount of solvent
relatively smaller surface area

⇒ Water insoluble enzymes can be prepared by using multifunctional agents that are bifunctional in nature and have
low molecular weight
high molecular weight
high equivalent weight
low reactivity

⇒ For glucose isomerization by immobilized enzyme, the reactor generally used is
CSTR
plug flow
packed bed
fluidized bed

⇒ Which medium is used for the production of Penicillin using immobilized cells
1% peptone medium
glucose medium
Yeast extract medium
LB broth

⇒ The support material for immobilization of cells of Bacillus subtilis is
ion exchange resins
gelatin
Anthracite
agarose and carbodiimide

⇒ 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
a diffusion cell with two compartments plus by a thin gel
a diffusion cell with two compartments multiply by a thin gel

⇒ 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

⇒ For a steady state condition, the change of substrate concentration (dC_s/dt) is
zero
1
>1
<1

⇒ Commonly employed water insoluble supports for the covalent attachment of enzyme include
acrylamide based polymers
polypeptides
dextran
all of these

⇒ During the enzymatic reaction of an immobilized enzyme, the rate of substrate transfer is
equal to that of substrate consumption
more than that of substrate consumption
lesser than that of substrate consumption
is nothing to do with the substrate consumption

⇒ The immobilized technique involving chemical method is
covalent bond formation dependent
non-covalent bond formation dependent
both (a) and (b)
ionic bond formation dependent

⇒ Which of the following is not a physical method of immobilization?
Adsorption
Entrapment
Micro encapsulation
None of these

⇒ 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

⇒ Which of the following is considered as a disadvantage to the adsorption method of immobilization?
It is possible to separate and purify the enzymes while being immobilized
The enzymes are not usually deactivated by adsorption
The adsorption is a reversible process
State of immobilization is very sensitive to solution pH, ionic strength and temperature