Hirudin is

(1) a protein produced by Hordeum vulgare, which is rich in lysine

(2) a toxic molecule isolated from Gossypium hirsutum, which reduces human fertility 

(3) a protein produced from transgenic Brassica napus, which prevents blood clotting

(4) an antibiotic produced by a genetically enginnered bacterium, Escherichia coli 

 64%
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Recombinant DNA technology involves several steps in which initial step is of isolation of the DNA. Which enzymes are used in the process for the breakdown of fungal cell, plant cell and bacterial cell respectively?

(1) Lysozyme, lipases, trypsin

(2) Chitinase, cellulase, lysozyme

(3) Chitinase, cellulase, trypsin

(4) Trypsin, lipases, cellulase

Subtopic:  Host & Desired DNA: II | Host & Desired DNA |
 93%
From NCERT
AIIMS - 2010
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What is the source of EcoRI?

(1) Escherichia coli R 1

(2) Escherichia coli R I 13

(3) Escherichia coli R Y 13

(4) Escherichia coli R X 13

Subtopic:  Tools: Enzymes: II | Tools |
 74%
From NCERT
AIIMS - 2011
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Which of the following is a cloning vector?

(1) DNA of Salmonella typhimurium

(2) Ti plasmid

(3) Amp' and Tet' loci

(4) Ori minus PBR322

Subtopic:  Tools: Vectors: II | Tools |
 71%
From NCERT
AIIMS - 2013
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Which of the following is a palindromic sequence?

(1) 5'-CGTATG-3'           

      3'-CGAATG-5'

(2) 5'-CGAATG-3'

     3'-GCATAC-5'                 

(3) 5'-GAATTC-3'

     3'-CTTAAG-5'      

(4) 5'-GACTAC-3'

     3'-CTTAAG-5'      

Subtopic:  Tools: Enzymes: II | Tools |
 94%
From NCERT
AIIMS - 2013
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How are transformants selected from nontransformants?

1. Presence of more than one recognition site in the vector DNA.

2. Presence of alien DNA into the vector DNA results into insertional inactivation of selectable marker.

3. Antibiotic resistance gene gets inactivated due to insertion of alien DNA.

4. Both 2 and 3.

Subtopic:  Selectable Markers: II | Selectable Markers: III | Selectable Markers |
 82%
From NCERT
AIIMS - 2014
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Which of the following is not a characteristic of pBR322 vector? 

(1) It is the first artificial cloning vector constructed in 1977 by Boliver and Rodriguez.

(2) It is the most widely used, versatile and easily manipulated vector.

(3) It has two antibiotic resistance genes, tetR and ampR.

(4) It does not have restriction site for Sal I.

Subtopic:  Tools: Vectors: II | Tools |
 76%
From NCERT
AIIMS - 2014
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Select the correct order of processing of PCR.

(1) Extension, primer annealing, denaturation

(2) Denaturation, primer annealing, extension

(3) Denaturation, extension, primer annealing

(4) Primer annealing, denaturation, extension

Subtopic:  Large Scale Production: I | Large Scale Production |
 85%
From NCERT
AIIMS - 2015
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Plasmid vector in DNA recombinant technology means

1. a virus that transfers gene to bacteria

2. extra-chromosomal autonomously replicating circular DNA

3. sticky end of DNA

4. any fragment of DNA carrying desirable gene

Subtopic:  Tools: Vectors: I | Tools |
 83%
From NCERT
AIIMS - 2015
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Which organism is used to transfer T-DNA?

(1) Streplomyces hygroscopicus

(2) Agrobacterium tumefaciens

(3) Salmonella typhi

(4) Escherichia coli

Subtopic:  Tools: Vectors: II | Tools |
 87%
From NCERT
AIIMS - 2015
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