Online Biochemical Engineering Test - Biochemical Engineering Test 9

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Total number of questions: 20.
Time allotted: 30 minutes.
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The conformational change in an enzyme after the substrate is bound that allows the chemical reaction to proceed, can be explained by

induced fit

transition

fit and fine

Pasteur

[#]

The rate-determining step of Michaelis Menten kinetics is

the complex formation step

the complex dissociation step to produce product

the product formation step

Both (a)and(c)

[#]

An enzyme is assayed at an initial substrate concentration of 2 x 10^-5M. In 6 minute, half of the substrate is used. The K_m for the substrate is 2 x 10^-3M. The value of k in minute is

0.115

0.42

0.093

6.693

[#]

When [S] = 0.1 *K_M, the velocity of an enzyme catalyzed reaction is about:

0.1 * V_max

0.3 * V_max

0.5 * V_max

0.7 * V_max

[#]

Which of the following is the commonly employed adsorbents?

Calcium carbonate

Alumina

Celluloses

All of these

[#]

The effectiveness factor increases with the

increase of diffusivity and decreased with the increase of particle size

increase of diffusivity and increased with the increase of particle size

decrease of diffusivity and decreased with the increase of particle size

increase of diffusivity and decrease with the decrease of particle size

[#]

Enzymes act as antimicrobials

by depriving an organism of a necessary metabolite

by generating a substances toxic to the organism

by attracting a cell wall component

all of the above

[#]

Chymosin hydrolyses the bond between

Alanine and glycine

Phenyl alanine and methonine

Glutamic acid and alanine

Alanine and phenyl alanine

[#]

Mixing profiles closest to plug flow are observed in

continuous packed bed reactor

stirred tank reactor with biomass recycles

continuous fluidized bed bioreactor

all of these

[#]

10.

In an airlift bioreactor, the air sparging region is called

downcomer

disengagement zone

air riser

none of these

[#]

11.

A flooded impeller will lead to poor oxygen transfer rates because

bubbles tend to coalesce under the impeller

bubbles tend to break down too rapidly under high shear conditions

bubbles tend to move too quickly through the bulk liquid

the cells clog up the surface of the bubble

[#]

12.

Surface renewal theory predicts that the mass transfer coefficient is

directly proportional to the square root of the molecular diffusivity

inversely proportional to the square root of the molecular diffusivity

directly proportional to the cube root of the molecular diffusivity

indirectly proportional to the cube root of the molecular diffusivity

[#]

13.

A cylindrical reactor fitted with Rushton Turbine has a liquid volume of 100,000 litres. It has an aspect ratio (the ratio of the channel height to the width) of 2:1. The diameter of the impeller should be approximately:

1.3 m

3.3 m

5.3 m

7.3 m

[#]

14.

What is the effect of the concentration of dissolved salts and sugars on the oxygen transfer rate?

The saturation concentration of oxygen in the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate

The K_La of the medium decreases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate

The K_La of the medium increases with the concentration of dissolved salts and sugars, leading to a lower oxygen transfer rate

None of the above

[#]

15.

Filamentous fungal cells are more shear sensitive than bacterial cells because of

the presence of citin in cell walls of filamentous fungi

larger in size than bacterial cells and therefore are more susceptible to shear forces

fungal cells are much larger than bacterial cells

all of the above

[#]

16.

A liquid is flowing at 11,400 l.h^-1 along a pipeline having a diameter of 4 cm. If the liquid has a density of 1 g.ml^-1 and viscosity of 0.001kg.m^-1.s^-1, then the liquid would be in the

laminar phase

transient phase

turbulent phase

any of the phase

[#]

17.

For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is

0.5

0.75

0.87

0.37

[#]

18.

Both temporary and permanent hardness of water can be removed on boiling water with

calcium hydroxide

sodium carbonate

calcium oxide

calcium carbonate

[#]

19.

Inhibitors are used along with sanitizer to

improve their action

to prevent corrosion

both (a) and (b)

none of these

[#]

20.

Lagoons may be characterized as

anaerobic

facultative

aerated

all of these

[#]

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Online Biochemical Engineering Test - Biochemical Engineering Test 9

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