Online Biochemical Engineering Test - Biochemical Engineering Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of these proteases is not a cysteine active site protease?

Calpain

Cathepsin D

Papain

None of the above

[#]

Which of the following statement(s) regarding enzymes, is/are false?

Enzymes are always proteins that function as catalysts

Enzymes provide activation energy for reactions

Enzyme activity can be regulated

Enzymes may be used many times for a specific reaction

[#]

Predominantly uncompetitive inhibition may be called when

competitive inhibition is greater than uncompetitive inhibition

competitive inhibition is smaller than uncompetitive inhibition

competitive inhibition is equal to uncompetitive inhibition

none of the above

[#]

Citrus juice debittering can be carried out using

limoninase

inulinase

anthocyanase

None of these

[#]

Which of the following metallic ion is there in ascorbic acid oxidase?

[#]

The enzyme used to reduce bitterness of grapes commonly contains

α-L-rhamonosidase

β-d-glucosidase

β- galactosidase

both (a) and (b)

[#]

Enzymes degrade, alter or synthesize a food component through

oxidation/reduction/isomerization

hydrolysis/synthesis

group transfer

all of the above

[#]

Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because

cells will redirect ATP to anabolism

cells will redirect NAD⁺ to anabolism

cells will redirect ATP to facilitate the diffusion of lactic acid and H⁺ out of the cells

cells will redirect ATP to the active transport of lactic acid and H⁺ out of the cells

[#]

Yield coefficient represents

total biomass or product produced

conversion efficiency of a substrate into product

conversion rate of a substrate into biomass or product

production time of biomass or product

[#]

10.

The optical density sometimes drops during the lag phase because

cells tend to grow without dividing leading to a decrease in the surface area to volume ratio

of fast cell growth causing them to fill up with DNA

cells swell up with water

cells swell up with RNA

[#]

11.

A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture.

continuous

batch

fed-batch

semi continuous

[#]

12.

Which of the following(s) is/are non-mechanically agitated reactors?

Stirrer tank reactor

Bubble column

Air lift reactor

Both (b) and (c)

[#]

13.

In a bioreactor, if at a particular time the oxygen transfer rate is 23 kg.h^-1, then the oxygen uptake will be

23 kg.h^-1

less than 23 kg.h^-1

greater than 23 kg.h^-1

2.3 kg.h^-1

[#]

14.

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

[#]

15.

Which of the following compound, if added to a solution will lead to the greatest increase in viscosity?

A globular protein

Glucose

A long chain protein such as albumin

Water

[#]

16.

Mixing in stirred tank reactors can

be described as either laminar, transient or turbulent

achieve turbulent conditions by increasing the stirrer speed

induce laminar flow conditions by the addition of baffles

all of the above

[#]

17.

The best described action of Pluronic F68 (non-ionic detergent) in a cell culture medium is that, it

acts on the surface properties of the cells and the culture medium

provides nutrients for the cells

acts as a flocculant

acts as a coagulant

[#]

18.

The collection efficiency by the inertial impaction mechanism is the function of

Stokes and Reynolds number

Stokes and Schmidt number

Grashoff and Reynolds number

Stokes and Grashof number

[#]

19.

The filter material used for air filtration system is/are

glass wool

glass fibre

norite

all of the above

[#]

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

[#]

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Online Biochemical Engineering Test - Biochemical Engineering Test - Random

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