The ability to multiply copies of antibioticresistance gene in $E$ coli is called…..

It is E.coli cloning vector

In gel electrophoresis, separated $DNA$ fragments can be visualized with the help of 

Following enzymes/chemical/technique are used in the process of gel electrophoresis

$I.$ sample $DNA$ is cut into fragments

$II.$ restriction endonucleases

$III.$ agarose gel

$IV.$ ethidium bromide

$V.$ UV-radiation

$VI.$ elution

Mark the correct sequence of their use

What does $H$ in $‘d’$ and $‘III’$ refer to in the enzyme $\rm {Hind}$ $III$ ?