Hind $II$ cuts the $\text{DNA}$ molecule at a particular point by recognizing a specific sequence of how many base pairs?

The most thoroughly studied of the known bacteria-plant interactions is the

$A$ single-stranded piece of nucleic acid tagged with a radioactive molecule,which is used to detect a specific gene through hybridization,is called:

Restriction endonuclease enzymes are used to:

Restriction enzymes that are used in the construction of recombinant $DNA$ are endonucleases which cut the $DNA$ at 'specific-recognition sequence'. What would be the disadvantage if they do not cut the $DNA$ at specific-recognition sequence?

$DNA$ probes are copied from $mRNA$ molecules with the help of: