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- Question
The function(s) of the draft tube in an airlift bioreactor is
Options- A. to reduce bubble coalescence
- B. to improve circulation
- C. to even out shear conditions throughout the reactor
- D. all of the above
- Correct Answer
- all of the above
- 1. The viscosity of a fluid increases with the length of time that it is being mixed. This fluid would be best described as being
Options- A. newtonian
- B. rheopectic
- C. viscoelastic
- D. thixotropic Discuss
- 2. Which of the following metallic ion is there in ascorbic acid oxidase?
Options- A. Mg
- B. Fe
- C. Cu
- D. Mn Discuss
- 3. The collection efficiency by impaction increases with
Options- A. increasing particle diameter
- B. increasing air flow velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
- 4. The specific death rate of an organism can be expressed as
Options- A. ln 2/D
- B. D/ln2
- C. D.ln2
- D. 2.0.3/ln2 Discuss
- 5. Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.
Options- A. Stanton
- B. Rayleigh
- C. Bond
- D. Froude Discuss
- 6. Which of the following is considered as a disadvantage to the adsorption method of immobilization?
Options- A. It is possible to separate and purify the enzymes while being immobilized
- B. The enzymes are not usually deactivated by adsorption
- C. The adsorption is a reversible process
- D. State of immobilization is very sensitive to solution pH, ionic strength and temperature Discuss
- 7. Which of the following statements is not true?
Options- A. Enzymes are proteins that bind to specific substrates and increase the velocity of reactions involving those substrates
- B. Enzymes function by overcoming the activation energy barrier of a reaction
- C. Enzymes make thermodynamically favorable reactions to proceed; they cannot make unfavorable reactions to occur
- D. Enzymes only function when they are in intact cells Discuss
- 8. A viscoelastic fluid is one in which the viscosity
Options- A. is constant regardless of the stirrer speed or mixing time
- B. changes during mixing but returns to its original state after mixing
- C. increases with increasing stirrer speed
- D. decreases with increasing stirrer speed Discuss
- 9. An allosteric inhibitor of an enzyme usually
Options- A. participates in feedback regulation
- B. denatures the enzyme
- C. is a hydrophobic compound
- D. causes the enzyme to work faster Discuss
- 10. Juice clarification extraction is facilitated by using
Options- A. cellulases
- B. amylase
- C. inulinase
- D. lactase Discuss
More questions
Correct Answer: rheopectic
Correct Answer: Cu
Correct Answer: both (a) and (b)
Correct Answer: ln 2/D
Correct Answer: Froude
Correct Answer: State of immobilization is very sensitive to solution pH, ionic strength and temperature
Correct Answer: Enzymes only function when they are in intact cells
Correct Answer: changes during mixing but returns to its original state after mixing
Correct Answer: participates in feedback regulation
Correct Answer: cellulases
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