Name the five key tools for accomplishing the tasks of recombinant $DNA$ technology. Also mention the functions of each tool.

(N/A) The five key tools for recombinant $DNA$ technology are:
$1$. Restriction endonucleases: These enzymes are used to cut $DNA$ molecules at specific recognition sequences.
$2$. Gel electrophoresis: This technique is used for separating $DNA$ fragments based on their size and charge.
$3$. Ligase enzymes: These enzymes are used to join or ligate $DNA$ fragments to create recombinant $DNA$ molecules.
$4$. $DNA$ delivery systems: Methods such as electroporation,microinjection,and the gene gun method are used to introduce recombinant $DNA$ into host cells.
$5$. Competent host: Organisms like bacteria or yeast are used as hosts to take up and replicate the recombinant $DNA$.