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- Question
The viscosity of a fluid changes with either stirrer speed or mixing time. But when mixing ceases, the viscosity returns to its original state. This fluid is best described as
Options- A. newtonian
- B. rheopectic
- C. viscoelastic
- D. thixotropic
- Correct Answer
- viscoelastic
- 1. The solvent flux across the membrane can be expressed as (where A is the area, Lp is the membrane permeability, ? is the reflection point, ?p is applied pressure and ?? is the osmotic pressure)
Options- A. J = Lp(?p - ???)
- B. J/A = Lp(?p - ???)
- C. J = Lp/???
- D. J/A = Lp/?p Discuss
- 2. A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be
Options- A. 2 litres
- B. 2 litres per hour
- C. 2 h-1
- D. 4 litres per hour Discuss
- 3. In sparged mammalian cell bioreactors, the cell damage is caused because of
Options- A. shear stress arising during mixing of the cell culture fluid
- B. shear stresses arising from the breakup of bubbles at the liquid surface
- C. shear stresses between bubbles in foam at the liquid surface
- D. all of the above Discuss
- 4. Michaelis Menten equation can also be written as
Options- A. (-Cs)/r = (Cs/rmax)+(Km/rmax)
- B. 1/r = (1/rmax)+(Km/(rmax.Cs))
- C. r = rmax-(Km.r/Cs)
- D. All of these Discuss
- 5. The height to diameter ratio (H/D) for the column fermenters is
Options- A. <3
- B. >3
- C. <1.5
- D. >1.5 Discuss
- 6. Enzymes act as antimicrobials
Options- A. by depriving an organism of a necessary metabolite
- B. by generating a substances toxic to the organism
- C. by attracting a cell wall component
- D. all of the above Discuss
- 7. The typical size of particles collected by diffusion mechanism is
Options- A. <0.25?m
- B. <0.5?m
- C. <0.75?m
- D. <1?m Discuss
- 8. An enzyme and a reactant molecule maintain relationship as
Options- A. a temporary association
- B. an association stabilized by a covalent bond
- C. one in which the enzyme is changed permanently
- D. non complementary binding Discuss
- 9. The prosthetic group present in phenolase enzyme is
Options- A. Mg
- B. Cu
- C. Ca
- D. Fe Discuss
- 10. Sulphydryl oxidase is used for
Options- A. discoloration
- B. clarification of images
- C. UHT milk off flavour removal
- D. all of these Discuss
More questions
Correct Answer: J = Lp(?p - ???)
Correct Answer: 2 h-1
Correct Answer: shear stress arising during mixing of the cell culture fluid
Correct Answer: All of these
Correct Answer: >3
Correct Answer: all of the above
Correct Answer: <0.5?m
Correct Answer: a temporary association
Correct Answer: Cu
Correct Answer: UHT milk off flavour removal
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