Which organism's plasmid was used for the construction of the first $r-DNA$?

  • A
    $E. coli$
  • B
    $Salmonella$ $typhimurium$
  • C
    $Bacillus$
  • D
    $Pseudomonas$

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$pBR322$ contains the recognition sites for which of the following endonucleases at the $amp^R$ site?

Genes of interest can be selected from a genomic library by using

An enzyme catalysing the removal of nucleotides from the ends of $DNA$ is:

Restriction enzymes belong to which class of enzymes?

$A$ : Ethidium bromide helps in visualizing $DNA$ in $UV$ light only.
$R$ : This intercalating agent absorbs light in range $260-330 \; nm$.

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