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WorksheetsECH5106 Biological Method
Total questions: 50
Worksheet time: 40mins
Which of the following gas is toxic to methanogenic bacteria?
carbon dioxide
Nitrogen
oxygen
hydrogen
Which method uses natural or genetically engineered plants to absorb, filter, and remove contaminants from soil and water?
physical methods
nanomagnets
phytoremediation
chemical methoda
What is bio-remediation?
Process where organic things are used to break down pollution
When you use biology to meditate
When you amend biological things
Process where you watch bacteria break things down
When you use bio-remediation it breaks down toxins ...
It makes the area into new soil
it creates a new substance for fuel
it detoxifies an area completely or partially
it creates fuel for algae
Bacteria can be used to clean up_________ in soil
OIl
Gasoline
Pesticides
All of the above
Myco-remediation is bio-remediation that uses...
Bacteria
Plants
Fungi
Worms
Phyto-remediation uses what for bio-remediation
Bacteria
Worms
Fungi
Plants
Plants can be used for bio-remediation because they...
Use the waste for nutrients
it binds and extracts
it uses the toxins and releases them in vapor form
it transforms them to N2
An example of a chemical, if in high concentrations, might not be bioremediated due to toxicity of chemicals is
lead
cadmium
both
neither
Still today oil is found from the Exxon Valdez spill. This remaining oil
will never breakdown
will breakdown slowly
will breakdown quickly
will be bioremediated this year by the government.
After the Exxon Valdez oil spill, experiments showed the natural biodegradation of oil can be increased greatly by adding
oxygen
nitrogen-containing fertilizer
phosphate
carbon-containing fertilizer
Oil sludge and straw or woodchips can be composed as long as the microbes have the right amount of
moisture
air
nitrogen
all of the above
How do we enhance the growth of naturally occurring microbes and speed up their decomposition of chemical pollutants?
adding sunlight
adding nutrients
adding toxins
adding more soil
when microbes use oxygen as final electron acceptor to convert pollutant into harmless product, it is called
aerobic bioremediation
anaerobic bioremediation
fermentation bioremediation
facultative bioremediation
The type of bioremediation, when the contaminated soil or water treats in the location where is was found, it is called....
In situ bioremediation
Ex situ bioremediation
Anaerobic bioremediation
Aerobic bioremediation
why bacteria formed biofilms?
as microbial self-defense that increase survival rate of life
allow bacterial cells to live in close association with each other
allow cells to remain in a favourable niche
all answers are correct
From the growth cycle graph, which is the stationary phase?
A
B
C
D
From the growth cycle graph, which is the exponential phase?
A
B
C
D
From the growth cycle graph, which is the lag phase?
A
B
C
D
Stirred-tank bioreactors have been designed for
(a) Addition of preservatives to the product
(b) Availability of oxygen throughout the process
(c) Ensuring anaerobic conditions in the culture vessel
(d) Purification of product
What is the type of this fermentation process?
Batch fermentation process
Fed-batch of fermentation process
Chemostat
Recylce process
This is used to promote aeration in bioreactor
Impeller
condenser
antifoam
sparger
Which are the advantages of solid-state fermentation?
Low capital cost
risk of contamination low
simple technology
difficult to scale up
...................is best suited for fungi that required less moisture content.
Batch
Continuous
Fed Batch
Solid state
for thorough mixing of medium and inoculum ,what is used
shaft
headspace
impeller
sparger
If all properties of a system, such as temperature, pressure, concentration, volume, mass, etc. do not vary with time, the process is said to be
Adiabatic
Steady
Unsteady
Continous
Which processes can operate under steady-state conditions.
Batch
Fed batch
Semi Fed batch
Continous
The symbol 𝛕 means
Process time
Residence time
Standard time
Decline time
The term Residence time generally used in
CSTR
Batch operation
Product operation
Fed-batch process
The process of making organic manure through degradation of plant and animal waste is called as
(a)
What is the best way to extract metals that are less reactive than carbon?
Bioleaching
Electrolysis
Phytomining
Reduction reaction
Is this an oxidation or reduction reaction?
water → hydrogen + oxygen
Oxidation
Reduction
Is this an oxidation or reduction reaction?
carbon + oxygen → carbon dioxide
Oxidation
Reduction
In the following reaction, which element has been oxidised and which has been reduced?
copper oxide + iron → iron oxide + copper
Copper has been oxidised, iron has been reduced
Iron has been oxidised, copper has been reduced
Decay bacteria
photosynthesize sugars
chemosynthesize sugars
use pigments to capture sunlight
break down organic matter and release nutrients
Which of the following plots will show a linear relationship for a second order reaction?
[A] vs time
1/[A] vs time
ln[A] vs time
[A]2 vs time
The following data were measured for the reaction
BF3(g) + NH3(g) ⟶ F3BNH3(g)
What is the rate law for the reaction?
rate = k[NH3]
rate = k[BF3]2[NH3]
rate = k[BF3][NH3]
rate = k[BF3][NH3]2
rate = k[A]
The rate constant in the rate law above is 0.5 L/mol·s. If the initial concentration of A is 0.1 M, how long will it take for [A] to drop to 0.025 M?
0.7 s
1.4 s
2.8 s
There is not enough information given.
Which factors increase the rate of a reaction?
increasing temperature
increasing concentration
increasing surface area
all of the above
In an exothermic reaction, heat is ...
absorbed
released
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
Higher
Lower
What is activation energy?
The maximum amount of energy used
The minimum amount of energy required for a reaction to start
The energy of the reactants
The energy possessed by the products
