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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The enzyme inhibition can occur by

reversible inhibitors

irreversible inhibitors

Both (a) and (b)

None of these

[#]

Which category of enzymes belongs to class 5 in the international classification?

Hydrolases

Isomerases

Oxido-reductases

Cyclase

[#]

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

[#]

Which of the following is not the correct answer?

Immobilized enzyme may show selectively altered chemical properties

Immobilized enzyme may show selectively altered physical properties

Immobilized enzyme may simulate the realistic natural environment where the enzyme come from the cell

None of the above

[#]

Enzymes degrade, alter or synthesize a food component through

oxidation/reduction/isomerization

hydrolysis/synthesis

group transfer

all of the above

[#]

The enzyme used to reduce bitterness of grapes commonly contains

α-L-rhamonosidase

β-d-glucosidase

β- galactosidase

both (a) and (b)

[#]

Immobilized cell reactors for wastewater treatment have the advantage of having/being

higher cell concentration

more stable and prevent washout

higher dilution rate before the cells washout

all of the above

[#]

The lowest yield of ATP /is in

fermentation

aerobic respiration

anaerobic respiration

same in (a), (b) and (c)

[#]

In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?

Citric acid is toxic to the cells

Alkanes cause foaming

Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates

Fast addition of alkanes will cause the cells to grow too quickly

[#]

10.

Bubble column reactor has

large height to diameter ratio

small height to diameter ratio

large diameter to height ratio

small diameter to height ratio

[#]

11.

The maximum specific growth rate (μ_m) of an organism in batch culture is equal to slope of a plot of

In [biomass] against time for exponential phase data only

In [biomass] against time

biomass against time

biomass against time for stationary phase data only

[#]

12.

The phenomenon in which substrates are used in a sequential manner is known as

trans-substrate genesis

dialism

diauxie

multiplicity

[#]

13.

Population doubling time, t_d can be expressed as (where μ is the specific growth rate.)

log2/μ

ln2/μ

μ/ln2

μ/log2

[#]

14.

Diauxie is

growth factors

microbiological die off

the simultaneous uptake of nutrients

the stagewise uptake of nutrients

[#]

15.

Which of the following type(s) of stirrer can be used for microbiological processes?

Mig

Intermig

Turbine

All of these

[#]

16.

Main reason for using baffles in stirred tank reactors are

baffles permit turbulence conditions to arise at low stirrer speed

baffles will allow axial mixing to occur even with radial flow impellers

both (a) and (b)

baffles prevent turbulent conditions in stirred tank reactors

[#]

17.

A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as

newtonian fluid

pseudoplastic, thixotropic fluid

dilatant, rheopectic fluid

dilatant, pseudoplastic fluid

[#]

18.

Conventional tertiary treatment is

chemical coagulation and flocculation

filtration

sedimentation

none of these

[#]

19.

Permanent hardness of water is caused by the presence of

bicarbonates of calcium and magnesium

carbonates of sodium and potassium

chlorides and sulfates of calcium and magnesium

phosphates of sodium and potassium

[#]

20.

Lagoons may be characterized as

anaerobic

facultative

aerated

all of these

[#]

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