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Biochemical Engineering
‣
Enzymes and Kinetics
See What Others Are Saying!
Question
If a reaction occurs in the absence of inhibitor with rate ?
0
and in the presence of inhibitor with rate ?
i
, the degree of inhibition is defined as
Options
A. (?
0
- ?
i
)/?
0
B. (?
0
+ ?
i
)/?
0
C. (?
0
?
i
)/?
0
D. (?
0
-?
i
)/?
i
Correct Answer
(?
0
- ?
i
)/?
0
More questions
1. Wash out in steady state fermentation occurs when
Options
A. dilution rate is less than maximum specific growth rate
B. dilution rate is higher than the maximum specific growth rate
C. cell concentration reaches the maximum
D. specific growth rate is maximum
Show Answer
Scratch Pad
Discuss
Correct Answer: dilution rate is higher than the maximum specific growth rate
2. The concentration of biomass in a continuous stirred tank reactor is 20 g dry weight per litre. What would be the concentration of biomass in the effluent?
Options
A. Greater than 20 g dry weight per litre
B. Approximately 20 g dry weight per litre
C. Lesser than 20 g dry weight per litre
D. More than 30 g dry weight per litre
Show Answer
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Correct Answer: Approximately 20 g dry weight per litre
3. Immobilized cell reactors for wastewater treatment have the advantage of having/being
Options
A. higher cell concentration
B. more stable and prevent washout
C. higher dilution rate before the cells washout
D. all of the above
Show Answer
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Discuss
Correct Answer: all of the above
4. 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
Show Answer
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Discuss
Correct Answer: rheopectic
5. Which of the following metallic ion is there in ascorbic acid oxidase?
Options
A. Mg
B. Fe
C. Cu
D. Mn
Show Answer
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Discuss
Correct Answer: Cu
6. 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
Show Answer
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Discuss
Correct Answer: both (a) and (b)
7. 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
Show Answer
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Discuss
Correct Answer: ln 2/
D
8. Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.
Options
A. Stanton
B. Rayleigh
C. Bond
D. Froude
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Correct Answer: Froude
9. 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
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Correct Answer: State of immobilization is very sensitive to solution pH, ionic strength and temperature
10. 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
Show Answer
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Discuss
Correct Answer: Enzymes only function when they are in intact cells
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More in Biochemical Engineering:
Agitation and Aeration
Downstream Processing
Enzymes and Application
Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment