Online Biochemical Engineering Test - Biochemical Engineering Test 1

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 statements is not true?
Enzymes are proteins that bind to specific substrates and increase the velocity of reactions involving those substrates
Enzymes function by overcoming the activation energy barrier of a reaction
Enzymes make thermodynamically favorable reactions to proceed; they cannot make unfavorable reactions to occur
Enzymes only function when they are in intact cells
Your Answer: Option
(Not Answered)
Correct Answer: Option

2.
An enzyme and a reactant molecule maintain relationship as
a temporary association
an association stabilized by a covalent bond
one in which the enzyme is changed permanently
non complementary binding
Your Answer: Option
(Not Answered)
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3.
The active site of an enzyme remains
at the center of globular proteins
rigid and does not change shape
complementary to the rest of the molecule
none of the above
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(Not Answered)
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4.
A classical uncompetitive inhibitor is a compound that binds
reversibly to the enzyme substrate complex yielding an inactive ESI complex
irreversibly to the enzyme substrate complex yielding an inactive ESI complex
reversibly to the enzyme substrate complex yielding an active ESI complex
irreversibly to the enzyme substrate complex yielding an active ESI complex
Your Answer: Option
(Not Answered)
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5.
The types of inhibition pattern based on Michaelis Menten equation are
competitive
non-competitive
uncompetitive
all of the above
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(Not Answered)
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6.
Milk digestibility is improved by using
RNase
lactase
β-amylase
none of these
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(Not Answered)
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7.
Which of the following metallic ion is there in ascorbic acid oxidase?
Mg
Fe
Cu
Mn
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(Not Answered)
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8.
The continuous cultures are not widely used in industry because
they are not suited for the production of secondary metabolites
contamination or mutation can have a disastrous effect on the operation
the government will not approve the licensing of pharmaceuticals produced in continuous cultures
all of the above
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(Not Answered)
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9.
Production of organic acids in batch culture is generally growth associated phase followed by non-growth associated production. The probable reason for this is that
organic acids uncouple catabolism from anabolism
biomass yields increase as the fermentation proceeds
organic acids are secondary metabolites
high concentrations of organic acid promote the growth of the microbial population
Your Answer: Option
(Not Answered)
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10.
Biomass concentrations during fermentation is
diluting the samples to optical density less than 0.3
monitored by controlling the changes in biomass concentrations
considering that optical density is proportional to the surface area of the biomass in the sample
all of the above
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(Not Answered)
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11.
Turbine impeller consists of flat impeller blades with
a vertical pitch welded directly to the shaft
a angled pitch welded directly to the shaft
a vertical pitch welded to a horizontal disk
a angled pitch welded to a horizontal disk
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12.
At 25°C, the saturation concentration of oxygen in water is 1.26 mmol/l and the partial pressure of oxygen is 1 atm. The Henry's law constant will be
0.793atml/mmol
0.207atml/mmol
1.26 atml/mmol
8.74 atml/mmol
Your Answer: Option
(Not Answered)
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13.
Small propellers turn at the speed of either
20 or 150 rpm
150 or 300 rpm
400 or 800 rpm
1150 rpm or 1750 rpm
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(Not Answered)
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14.
Which of the following model holds correct for the two-film theory? (where KL is the mass transfer coefficient, DAB diffusivity and Zf film thickness)
KL = DAB/Zf
KL = DAB
KL = Zf/DAB
KL = DAB.Zf
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(Not Answered)
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15.
Pluronic F68 is added to cell culture media as
a nutrient
a shear protectorant
to increase oxygen transfer rates
all of these
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16.
Which of the following can act as a shear protectorant?
Serum
Silicone oil
Glucose
Glutamic acid
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(Not Answered)
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17.
For the extractions operation, the selectivity should be
> 1
< 1
1
zero
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(Not Answered)
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18.
Permanent hardness of water may be removed by the addition of
lime
soda ash
potassium permagnate
sodium bicarbonate
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(Not Answered)
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19.
Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
insoluble carbonates
insoluble zeolites
insoluble chlorides
insoluble sulfates
Your Answer: Option
(Not Answered)
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20.
The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
600 ppm
300 ppm
500 ppm
1000 ppm
Your Answer: Option
(Not Answered)
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