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 Multiple Choice QuestionsMultiple Choice Questions


Which of the following is a cloning vector?

  • DNA of Salmonella typhimurium

  • Ti plasmid

  • Amp' and Tet' loci

  • Ori minus pBR322


In cloning of cattle a fertilized egg is taken out of the mother's womb and

  • in the eight cell stage, cells are separated and cultured untill small embryos are formed which are implanted into the womb of other cows

  • in the eight cell stage the individual cells are separated under electrical field for further development in culture media

  • from this upto eight identical twins can be produced

  • the egg is divided into 4 pairs of cells which are implanted into the womb of other cows.


How are transformants selected from nontransformants

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

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

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

  • Both (b) and (c).


Which of the following is not a characteristic of pBR322 vector

  • It is the first artificial cloning vector constructed in 1977 by Boliver and Rodriguez.

  • It is the most widely used, versatile and easily manipulated vector.

  • It has two antibiotic resistance genes, tetand ampr.

  • It does not have restriction site for Sal I.


What is a plasmid?

  • Bacterial, linear, dsDNA

  • Extrachromosomal linear RNA

  • Extrachromosomal circular dsDNA

  • Autonomously replicating circular RNA


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?

  • Lysozyme, lipases, trypsin

  • Chitinase, cellulase, lysozyme

  • Chitinase, cellulase, trypsin

  • Trypsin, lipases, cellulase


What is the source of EcoRI

  • Escherichia coli R I

  • Escherichia coli R I 13

  • Escherichia coli R Y 13

  • Escherichia coli RX 13


Which one of the following options is a correct match of phenomenon and its explanation

  • Reverse Transcription PCR - Many copies of a DNA sequence.

  • Central dogma - RNA > DNA > Protein > RNA.

  • RNA silencing - Use of ds-RNA to stop the expression of ss-RNA.

  • Transcription- Process of formation of RNA & proteins.


Assertion : Restriction enzymes cut the strand of DNA to produce sticky ends.

Reason : Stickiness of the ends facilitates the action of the enzyme DNA polymerase.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


A tumor inducing plasmid widely used in the production of transgenic plants is that of

  • Escherichia coli

  • Bacillus thuringiensis

  • Staphylococcus aureus

  • Agrobacterium tumefaciens