Agrobacterium tumefaciens contains a large plasmid that induces tumors in plants,known as:

What does $R$ represent in $EcoR\, I$?

The key tools required for the recombinant $DNA$ technology are:
$I.$ Enzymes
$II.$ $RNA$ primer
$III.$ $DNA$ probe
$IV.$ Vectors
$V.$ Host organisms
Select the correct option.

In $EcoR\, I$,what do the letters $E$ and $R$ stand for,respectively?

Assertion : Plasmids are extrachromosomal $DNA$.
Reason : Plasmids are found in bacteria and are useful in genetic engineering.

Identify true or false:
$(i)$ Restriction site is always a palindromic sequence.
$(ii)$ Palindromic sequence is always a restriction site.