Questions and answers for exam Preparation

MCQs

Total Questions : 69 | Page 3 of 7 pages

Question 21. Which of the following immobilized organism is not used to produce lactases?

Kluyveromyces lactis
Mortierella vinacea
Aspergillus Niger
Aspergillus Oryzae

Discuss Question

Answer: Option B. -> Mortierella vinacea
Answer: (b).Mortierella vinacea

Question 22. Immobilized __________ was used to resolve racemic mixtures of aminoacids.

hydantoinase
aspartase
histidase
aminoacyclase

Discuss Question

Answer: Option D. -> aminoacyclase
Answer: (d).aminoacyclase

Question 23. Which of the following is not true for immobilized lactases?

Product inhibition by galactose
Unwanted oligosaccharide formation
Microbial contamination
Batch variability problems of acid hydrolysis

Discuss Question

Answer: Option D. -> Batch variability problems of acid hydrolysis
Answer: (d).Batch variability problems of acid hydrolysis

Question 24. Which enzyme helps in the production of D-aminoacids?

Aminoacyclase
Invertase
Hydantoinase
Raffinase

Discuss Question

Answer: Option C. -> Hydantoinase
Answer: (c).Hydantoinase

Question 25. A vessel or series of vessels which is used to perform the desired conversion by enzymic means is referred to as ______________

centrifuge
entrapment
biosensors
enzyme reactors

Discuss Question

Answer: Option D. -> enzyme reactors
Answer: (d).enzyme reactors

Question 26. In which of the enzyme reactors, the enzyme is held within membrane tubes allowing the substrates to diffuse in and the products to diffuse out?

Batch membrane reactors
Continuous Stirred tank batch reactors
Continuous flow membrane reactor
Packed bed reactors

Discuss Question

Answer: Option A. -> Batch membrane reactors
Answer: (a).Batch membrane reactors

Question 27. What does the following equation represent?
\(\frac{V_{max}}{Vol_s} t=[S]_0 X-K_m ln⁡(1-X)\)

Miachelis Menten kinetics equation for enzymes
Miachelis Menten kinetics equation for immobilized enzymes
Miachelis Menten kinetics equation for stirred tank batch reactors
Miachelis Menten kinetics equation for non-competitive inhibition

Discuss Question

Answer: Option C. -> Miachelis Menten kinetics equation for stirred tank batch reactors
Answer: (c).Miachelis Menten kinetics equation for stirred tank batch reactors

Question 28. ____________ is one which expresses the efficiency with which the energy dissipated in producing the fluid flow is used to transport material (and heat) to the catalytic surface.

Normalized time
Le Goff number
Reynolds number
Fractional conversion

Discuss Question

Answer: Option B. -> Le Goff number
Answer: (b).Le Goff number

Question 29. Which of these is a disadvantage of membrane reactors?

Membranes need to be replaced at regular intervals
These may be used in either batch or continuous mode
These reactors allow easy removal of enzyme from the product
These reactors avoid the costs and problems associated with other methods of immobilization

Discuss Question

Answer: Option A. -> Membranes need to be replaced at regular intervals
Answer: (a).Membranes need to be replaced at regular intervals

Question 30. Packed bed reactor is not referred to as plug flow reactor.