Identify the vectors for animals and plants respectively.

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

About gene gun method:
$I.$ This method is also known as biolistic technique.
$II.$ In this method,cells are bombarded with high-velocity micro-particles of gold or tungsten coated with $DNA$ in plants.
$III.$ Important crop plants like maize,rice,and wheat have now been transformed by this method.
Which of the statements given above are correct?

Identify the palindromic nucleotide sequence.

Select the correct pair from the following:

Which of the following is a palindromic sequence?