In a mixture, $DNA$ fragments are separated by

Given below are two statements:

Statement $I:$

Restriction endonucleases recognise specific sequence to cut DNA known as palindromic nucleotide sequence.

Statement $II:$

Restriction endonucleases cut the $DNA$ strand a little away from the centre of the palindromic site.

In the light of the above statements, choose the most

appropriate answer from the options given below :

Restriction enzymes are isolated chiefly from:

Which of the following is commonly used as a vector for introducing a $DNA$ fragment in human lymphocytes?

Cutting of a piece of $DNA$ from a plasmid was done with the help of $…A…$ enzymes, popularly known as $…B….$ Here $\mathrm{A}$ and $\mathrm{B}$ can be