Online Biochemical Engineering Test - Biochemical Engineering Test 4

Instruction:

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  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
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  • All the best!

Marks : 2/20


Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.

1.
Which of the following activity is possible by transferases?
Transfer of methyl groups
Transfer of glycosyl group
Both (a) and (b)
None of these
Your Answer: Option
(Not Answered)
Correct Answer: Option

2.
The active site of an enzyme differs from an antibody-antigen binding site in that the enzyme active site
contains modified amino acids
catalyzes a chemical reaction
is complementary to a specific ligand
contains amino acids without side chains
Your Answer: Option
(Not Answered)
Correct Answer: Option

3.
The equation for the rate of product formation for simple enzyme reaction is given by (Where rmax, maximum reaction rate, Cs substrate concentration, Cp product concentration ES, CES enzyme-substrate concentration)
rp = rmax Cs/(Km+Cs)
rp= rmax CES/(Km+ CES)
rp = rmax Cs/(Km+CES)
rp = rmax Cs/(Km+Cp)
Your Answer: Option
(Not Answered)
Correct Answer: Option

4.
The slope of Lineweaver Burk plot for Michaelis Menten equation is
Vmax/Km
Km/Vmax
1/Km
Km.Vmax
Your Answer: Option
(Not Answered)
Correct Answer: Option

5.
Which is true about rennet?
It is a mixture of protease chymosin and pepsin
It is a mixture of rennin and pepsin
Both (a) and (b)
none of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option

6.
The enzyme used to reduce bitterness of grapes commonly contains
α-L-rhamonosidase
β-d-glucosidase
β- galactosidase
both (a) and (b)
Your Answer: Option
(Not Answered)
Correct Answer: Option

7.
A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.
continuous
batch
fed-batch
semi continuous
Your Answer: Option
(Not Answered)
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8.
When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out?
Organism maintaining the highest substrate concentration
Organism maintaining the lowest substrate concentration
Both (a) and (b)
Organism maintaining the moderate substrate concentration
Your Answer: Option
(Not Answered)
Correct Answer: Option

9.
Low dissolved oxygen concentrations leads to
low biomass yields
high biomass yields
no effect on biomass yields
none of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option

10.
The specific growth rate (μ) is defined as
the concentration of biomass in the reactor
rate of increase of total biomass in a reactor
the rate of individual cells division or increase in their biomass
the rate of cell death
Your Answer: Option
(Not Answered)
Correct Answer: Option

11.
The height to diameter ratio (H/D) for the tank fermenters is
<3
>3
<1.5
>1.5
Your Answer: Option
(Not Answered)
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12.
A reactor has a total volume of 50,000 litres. If it has a headspace volume of 10,000 litres, then volume of liquid in the reactor will be
10,000 l
20,000 l
30,000 l
40,000 l
Your Answer: Option
(Not Answered)
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13.
If the stirrer speed is too slow, bubbles will accumulate and coalescese under the impeller. This phenomenon is known as a
coalesced impeller
flooded impeller
river impeller
dry impeller
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(Not Answered)
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14.
In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)
H = Vs/(Vs-Vt)
H = Vs/(Vs+ Vt)
H = Vs/(Vs.Vt)
H = (Vs+Vt)/Vs
Your Answer: Option
(Not Answered)
Correct Answer: Option

15.
The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
the concentration of lactate in the medium
the level of lactate oxidase activity in the medium
the level of lactate dehydrogenase activity
the level of lactase activity in the medium
Your Answer: Option
(Not Answered)
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16.
Which of the following affect the Kolmogorov eddy size?
Stirrer speed
Physical properties of the liquid
Size and type of impeller
All of these
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(Not Answered)
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17.
Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where NSt is the Stokes number)
ηimp = 0.075NSt1.2
ηimp = 0.75NSt1.2
ηimp = 0.25NSt1.2
ηimp = 0.025NSt1.2
Your Answer: Option
(Not Answered)
Correct Answer: Option

18.
The collection efficiency by impaction increases with
increasing particle diameter
increasing air flow velocity
both (a) and (b)
increasing particle size
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(Not Answered)
Correct Answer: Option

19.
The optimum wet solid content for the cell suspension for a bead mill is typically somewhere between
5-15% by volume
15-30% by volume
30-60% by volume
60-90% by volume
Your Answer: Option
(Not Answered)
Correct Answer: Option

20.
Sedimentation is a physical process used in wastewater treatment to
remove particles that are less dense than water
remove particles that are more dense than water
remove the pertinacious material from the water
none of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option

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