Questions and answers for exam Preparation

MCQs

Total Questions : 65 | Page 2 of 7 pages

Question 11. In a biphasic system, the thickness of the aqueous layer (δ) around an immobilised enzyme lowers the rate of reaction.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 12. What does α represent in the below equation?
\(K_{biphasic} = K_w (\frac{1+αP_B}{1+αP_A})\)

\(\frac{[B_w]}{[A_w]}\)
\(\frac{V_{org}}{V_w}\)
\(\frac{[B_t]}{[A_t]}\)
\(\frac{[B_{org}]}{[B_w]}\)

Discuss Question

Answer: Option B. -> \(\frac{V_{org}}{V_w}\)
Answer: (b).\(\frac{V_{org}}{V_w}\)

Question 13. For immobilized enzymes, the volumetric surface area (A/V) is an important parameter which does not govern which of the following?

The overall flux of the substrate to the biocatalytic surface
Effectiveness of the enzyme
Recovery of the biocatalyst
Productivity

Discuss Question

Answer: Option C. -> Recovery of the biocatalyst
Answer: (c).Recovery of the biocatalyst

Question 14. Which of this is true for optimizing a two-phase system for enzyme-catalyzed reactions?

Protection of the contained enzyme
More facile recovery of the biocatalyst
The difference between the Log P values of the substrates and the interphase should be as small as possible
Allowing efficient and continuous use of biphasic PBRs

Discuss Question

Answer: Option C. -> The difference between the Log P values of the substrates and the interphase should be as small as possible
Answer: (c).The difference between the Log P values of the substrates and the interphase should be as small as possible

Question 15. Which of the following rule belongs to optimization of the two-phase system for enzyme-catalyzed reactions?

The difference between the Log P values of the products and the organic phase should be as small as possible
Allows to be used with low molecular weight hydrophilic coenzymes with the assistance of a coenzyme regenerating process
Allowing efficient and continuous use of biphasic PBRs as long as the moving organic phase is saturated with water
Allowing efficient and continuous use of biphasic PBRs

Discuss Question

Answer: Option A. -> The difference between the Log P values of the products and the organic phase should be as small as possible
Answer: (a).The difference between the Log P values of the products and the organic phase should be as small as possible

Question 16. The conversion of porcine insulin to human insulin is achieved by ____________ reaction.

hydrogenation
transpeptidation
kinetically controlled synthesis
decomposition

Discuss Question

Answer: Option B. -> transpeptidation
Answer: (b).transpeptidation

Question 17. Use of glycosidases in synthetic reactions is a comparatively neglected topic.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 18. Which of the following enzyme is not used to construct oligosaccharides?

Dextransucrase
Levansucrase
Papain
Cyclomaltodextrin glucanotransferase

Discuss Question

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

Question 19. Which of the following compounds are synthesized by fructosyltransferases?

Sucrose-6-acetate
Xylosucrose
L-aspartate
Neosugar

Discuss Question

Answer: Option C. -> L-aspartate
Answer: (c).L-aspartate

Question 20. ____________ is a low cariogenic sweetener, which consists of a mixture of glucose, sucrose and β-2,1 linked fructans with terminal non-reducing glucose residues.