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(D) The correct answer is $D$. In recombinant $DNA$ technology,vectors (such as plasmids) are engineered to contain selectable markers,which are typic

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transformed cells

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(D) The correct answer is $D$. In recombinant $DNA$ technology,vectors (such as plasmids) are engineered to contain selectable markers,which are typically antibiotic resistance genes (e.g.,$amp^R$,$tet^R$). When host cells (like $E. coli$) are treated with the recombinant vector,only those cells that successfully take up the vector (transformed cells) will acquire the antibiotic resistance trait. By plating these cells on a medium containing the specific antibiotic,only the transformed cells will survive and form colonies,while non-transformed cells will be killed.

An antibiotic resistance gene in a vector usually helps in the selection of

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

To isolate $DNA$ from fungi, the cell wall must be broken down. This process is carried out by which of the following enzymes?

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The ligation of an antibiotic resistance gene with a plasmid vector can be performed by which of the following enzymes?

In recombinant $DNA$ technology,a vector is defined as .....

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