Adsorption onto a solid phase support followed by elution is used as an alternative for separation of which component?
1.chromosomal DNA
2.plasmid DNA
3.RNA alone
4.other impurities
Posted Date:-2022-07-04 18:51:04
Bacteriophage lambda is having a phage recombination system. Following are the characteristics of this system ____________
1.It is used for inserting phage genome into the bacterium
2.It is used for inserting bacterial genome into the phage
3.The specific site in bacteria is attB and that in phage is attP
4.The specific sites in both of them are called as attP
Posted Date:-2022-07-04 18:38:56
Cell lysis is carried out by which substance?
1.Lysozyme and detergents
2.Water
3.Sugar solution
4.Suphuric Acid
Posted Date:-2022-07-04 18:47:47
Chemical transformation refers to the methods which use chemicals in order to carry out transformation. Which of the following statements is true with respect to it?
1.Chemical transformation decreases the efficiency of transformation as compared to natural transformation
2.Ice cold calcium solution followed by heat shock is responsible for affecting the efficiency of DNA uptake
3.The mechanism responsible for it named as ‘the heat shock model’
4.Other complex mixtures such as those containing Manganese and hexamine cobalt can’t be used to affect the efficiency
Posted Date:-2022-07-04 18:44:10
Chromosomal or genomic DNA is separated by ____________
1.Sedimentation
2.Dissolution in water
3.Centrifugation
4.Distillation
Posted Date:-2022-07-04 18:48:15
Deficiency of lime in cement leads to:
1.Unsound cement
2.Disintegration of cement
3.Quick setting of cement
4.Expansion of cement
Posted Date:-2022-07-07 05:47:16
Electroporation is also used for taking up the DNA by the cells. It constitutes of ____________
1.inserting the DNA into the cells via an electric shock
2.increased efficiency than both natural and chemical methods
3.causing the least amount of damage in comparison to other methods
4.decreased efficiency than both natural and chemical methods
Posted Date:-2022-07-04 18:44:51
Enzyme commonly used for carrying out ligation reaction is ____________
1.Transferase
2.Reverse transciptase
3.Ligase
4.DNase
Posted Date:-2022-07-04 18:32:40
Excess of Alkali in cement results in:
1.Dry cement paste
2.Efflorescence
3.Less plasticity
4.Unsound cement
Posted Date:-2022-07-07 05:50:02
F plasmid is often used in conjugation. The correct statement is?
1.The F plasmid encodes the factor which is transferred from one cell to another
2.The factor encoded by the F plasmid is called as Filamentous (F) factor
3.It is transferred from one cell to another by filament
4.The bacteria must belong to same species to carry out the conjugation
Posted Date:-2022-07-04 18:42:53
Green cement is:
1.Green coloured cement
2.Cement mixed with plant products
3.Cement mixed with recycled materials
4.Cement mixed with green algae
Posted Date:-2022-07-07 05:43:58
How many methods are there for obtaining the plasmid DNA from the bacteria?
1.1
2.2
3.3
4.4
Posted Date:-2022-07-04 18:47:18
If blunt ended ligations are to be carried out. Which of the following enzymes can be used?
1.E. coli DNA ligase
2.T4 DNA ligase
3.Both of these enzymes act equally in carrying out blunt ended ligations
4.None of them is able to carry out blunt ended ligations
Posted Date:-2022-07-04 18:34:09
Introduction of DNA molecules into the recipient organism is termed as ____________
1.transformation
2.translation
3. transduction
4.transcription
Posted Date:-2022-07-04 18:40:20
Isolation of genomic DNA follows the same principles as that of obtaining plasmid from E. coli. Which of the following is not included in it?
1.Cell lysis
2.Removal of proteins
3.Removal of chromosomal DNA
4. Dissolving plasmid in water
Posted Date:-2022-07-04 18:46:55
Ligation enzymes are used for ligating newly synthesized okazaki fragments. What holds true for okazaki fragments?
1.Okazaki fragments are short fragments of DNA formed on the leading strand
2.Okazaki fragments are large fragments of DNA formed on the lagging strand
3.Okazaki fragments are short fragments of DNA formed on the lagging strand
4.Okazaki fragments are large fragments of DNA formed on the leading strand
Posted Date:-2022-07-04 18:39:37
Many bacterial species are having a natural ability to take up the exogenous DNA material. Which of the statement is not correct in regard to it?
1.This ability is termed as competence
2.It is not limited to particular growth phases
3.The bacteria may develop new biochemical abilities under special conditions such as nutrient deprivation
4.Induction of specific set of bacterial proteins may take place
Posted Date:-2022-07-04 18:41:35
Mechanism of ligation for both T4 DNA ligase and E. coli DNA ligase makes use of Adenosine Monophosphate (AMP). Which of the steps is involved in the ligation mechanism?
1.AMP is added to the 5’ phosphate of one of the DNA molecule
2.It leads to the liberation of pyrophosphate from NAD and nicotinamide mononucleotide from ATP
3.The AMP is further displaced by an electrophilic attack
4.The AMP is further displaced by nucleophilic attack by 3’ hydroxyl of the same DNA molecule
Posted Date:-2022-07-04 18:35:07
Nucleic acid precipitated constitutes of ____________
1.plasmid DNA
2.plasmid DNA, along with RNA and chromosomal DNA
3.rna alone
4.chromosomal DNA only
Posted Date:-2022-07-04 18:49:39
Phage based recombination systems are used for ____________
1.cleaving the molecules at specific sites
2.adding the molecules at specific sites
3.breakage and rejoining the molecules at specific sites
4.breakage at random sites
Posted Date:-2022-07-04 18:38:20
Plasmids can be classified into how many types depending on the genes present for their transformation?
1.1
2.2
3.3
4.4
Posted Date:-2022-07-04 18:43:22
Proteins can be removed via treatment by?
1.Phenol and chloroform treatment
2.Treatment with sodium hydroxide
3.Chloroform treatment alone
4.Centrifuging
Posted Date:-2022-07-04 18:48:48
Purification of DNA by using silica derivatized groups by DEAE is termed as ____________
1.ion exchange resin based method.
2.silica based purification
3.atom based resin exchange method
4.packed bed purification
Posted Date:-2022-07-04 18:52:09
Sand does not show any bulking when:
1.Completely saturated
2. Partially saturated
3.Contains small amount of impurities
4.Voids are partially filled with air
Posted Date:-2022-07-07 05:30:04
The location of plasmid DNA can be visualized by addition of:
1.bromophenol blue
2.ethidium bromide
3. ortho xylene
4.texas red
Posted Date:-2022-07-04 18:53:50
The particle gun method consists of which of the following steps?
1.The DNA of interest is absorbed onto microprojectile beads
2.These beads are often made of aluminium
3.The explosion in a gun propels a macroprojectile forward which in turn propels microprojectile beads
4.The macroprojectiles and microprojectiles both cross the perforated plate and hit the target tissue behind it
Posted Date:-2022-07-04 18:46:03
Time elapsed from the instance of adding water until paste ceases to behave as fluid is called:
1.Initial setting time
2.Final setting time
3.Intermediate setting time
4. Absolute setting time
Posted Date:-2022-07-07 05:37:57
Topoisomerase is also an enzyme which is used for carrying out ligation. The correct statement for topoisomerase is?
1.They act only on double stranded molecules
2.They alter the degree of supercoiling of DNA molecules
3.They are less effective than conventional DNA ligase
4.There are three types of topoisomerases
Posted Date:-2022-07-04 18:35:51
Transformation carried out using a particle gun is known as biolistic transformation. It falls under which category of transformation?
1.Physical
2.Chemical
3.Electroporation
4.Natural
Posted Date:-2022-07-04 18:45:26
Treatment with exonuclease leads to removal of ____________
1.remnants of chromosomal DNA
2.RNase
3.plasmid DNA which is circularized
4.proteins
Posted Date:-2022-07-04 18:50:13
Use of coarser cement particles leads to:
1.Low durability
2.Higher strength
3.Low consistency
4.Higher soundness
Posted Date:-2022-07-07 05:41:19
What are the effects of increasing concentration of reaction components?
1.It increases chances of ligation in both intramolecular and intermolecular reactions
2.It increases chances of ligation only in intermolecular and no effect on intramolecular
3.It decreases chances of ligation in intramolecular and increases in that of intermolecular
4.It decreases chances of ligation in both types of reaction
Posted Date:-2022-07-04 18:30:57
What effect does bulking have on fresh concrete?
1.Strength reduces
2.Shrinkage increases
3.Volume reduces
4.Workability increases
Posted Date:-2022-07-07 05:30:39
What effect does calcium sulphate have on cement?
1.Retards setting action
2.Acts as flux
3.Imparts colour
4.Reduces strength
Posted Date:-2022-07-07 05:47:44
What is the average particle size of cement?
1.15 microns
2.45 microns
3.75 microns
4.100 microns
Posted Date:-2022-07-07 05:34:30
What is the depth the needle in Vicat apparatus should penetrate into the cement paste in consistency test?
1.33-35 cm from bottom of the mould
2.33-35 mm from top of the mould
3.33-35 cm from top of the mould
4.33-35 mm from bottom of the mould
Posted Date:-2022-07-07 05:44:41
What is the initial setting time of cement?
1.1 hour
2.30 minutes
3.15 minutes
4.30 hours
Posted Date:-2022-07-07 05:40:48
What is the meaning of soundness of cement?
1.Ability to flow when mixed
2.Ability to make ringing noise when struck
3.Ability to form strong and sound structure
4.Ability to retain volume after setting.
Posted Date:-2022-07-07 05:35:08
What is the most dominant constituent of cement?
1.Silica
2.Lime
3.Magnesia
4.Alumina
Posted Date:-2022-07-07 05:46:44
Which equipment is used to test the setting time of cement?
1.Core cutter
2.Vibrator
3. Universal testing machine (UTM)
4.Vicat apparatus
Posted Date:-2022-07-07 05:40:12
Which of the below mentioned is not a result of field test performed on cement?
1.There should not be any lumps
2. It should feel cold when you put your hand in bag of cement
3.The colour should be blackish grey
4.It should not be gritty when rubbed with finger
Posted Date:-2022-07-07 05:39:32
Which of the following adds a quick-setting property to cement?
1.Magnesium oxide
2.Silicon dioxide
3.Iron oxide
4.Aluminium oxide
Posted Date:-2022-07-07 05:49:02
Which of the following components bind to the solid column made of silica, under high salt concentration?
1.Proteins
2.Polysaccharides
3.Both proteins and polysaccharides
4.Plasmid DNA
Posted Date:-2022-07-04 18:51:37
Which of the following components settles at the bottom?
1.RNA
2.Proteins
3.Nicked DNA
4.Supercoiled DNA
Posted Date:-2022-07-04 18:53:22
Which of the following imparts greenish grey colour to cement?
1.Calcium silicate
2.Calcium aluminate
3.Calcium aluminate ferrite
4.Calcium carbonate
Posted Date:-2022-07-07 05:49:32
Which of the following is correct with respect to caesium chloride centrifugation?
1.Caesium is light in weight
2.The dissolution of caesium and nucleic acids leads to the formation of gradients
3.According to the amount of supercoiling and A+T content, the DNA settles
4.Nicked DNA settles below than supercoiled DNA
Posted Date:-2022-07-04 18:52:56
Which of the following statements is correct with respect to T4 DNA ligase?
1.It can carry out only blunt ended ligations
2.It doesn’t requires ATP
3.It requires a phosphate group at 3’ end and a hydroxyl group at 5’ end for the molecule to be joined
4.It is obtained from T4 bacteriophage upon infection by E. coli
Posted Date:-2022-07-04 18:33:29
Which of the statements hold true for conjugation?
1.Conjugation is the natural process of transferring DNA from one species to another
2.It is the artificial process in case the cells are not able to take them up naturally
3.The plasmids are transferred from one cell to another by physical contact
4.The plasmids are transferred from one cell to another by chemical means
Posted Date:-2022-07-04 18:42:15
Who invented Portland cement and in which year?
1.William Aspdin, 1824
2. William Aspdin, 1840s
3.Joseph Aspdin, 1840s
4. Joseph Aspdin, 1824
Posted Date:-2022-07-07 05:34:05
Why is natural cement used very limitedly?
1.Brown in Colour
2.Standard consistency is not met with
3.Sets too quickly
4.Particle size is too fine
Posted Date:-2022-07-07 05:33:35