1.
The DNA fragments separated on an agarose gel can be visualised after staining with:
A
Acetocarmine
B
Aniline blue
C
Ethidium bromide
D
Bromophenol blue
Answer :
Ethidium bromide
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2.
In bacterial chromosomes, the nucleic acid polymers are
A
linear DNA molecule
B
circular DNA molecule
C
of two types-DNA and RNA
D
linear RNA molecule
Answer :
circular DNA molecule
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3.
DNA or RNA segment tagged with a radioactive molecule is called
A
Vector
B
Probe
C
Clone
D
Plasmid
Answer :
Probe
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4.
What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?
A
The smaller the fragment size, the farther it moves
B
Positively charged fragments move to farther end
C
Negatively charged fragments do not move
D
The larger the fragment size, the farther it moves
Answer :
The smaller the fragment size, the farther it moves
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5.
The correct order of steps in Polymerase Chain Reaction (PCR) is
A
Extension, Denaturation, Annealing
B
Annealing, Extension, Denaturation
C
Denaturation, Annealing, Extension
D
Denaturation, Extension, Annealing
Answer :
Denaturation, Annealing, Extension
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6.
Introduction of food plants developed by genetic engineering is not desirable because
A
economy of developing countries may suffer
B
these products are less tasty as compared to the already existing products
C
this method is costly
D
there is danger of entry of viruses and toxins with introduced crop
Answer :
there is danger of entry of viruses and toxins with introduced crop
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7.
What is antisense technology?
A
A cell displaying a foreign antigen used for synthesis of antigens
B
Production of somaclonal variants in tissue cultures
C
When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
D
RNA polymerase producing DNA
Answer :
When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
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8.
Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
A
Retrovirus
B
Ti plasmid
C
pBR 322
D
$$\lambda $$ phage
Answer :
Retrovirus
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9.
The plasmid
A
helps in respiration
B
genes found inside nucleus
C
is a component of cell wall of bacteria
D
is the genetic part in addition to DNA in micro-organisms
Answer :
is the genetic part in addition to DNA in micro-organisms
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10.
Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to
A
Fungal diseases
B
Plant nematodes
C
Insect predators
D
Insect pests
Answer :
Insect pests
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