$A$ gene library or $DNA$ library contains a collection of:

Identify the palindromic nucleotide sequence.

Given below are two statements :-
Statement-$I$ : Restriction endonucleases recognize specific sequences to cut $\text{DNA}$ known as selectable nucleotide sequences.
Statement-$II$ : Restriction endonucleases cut the $\text{DNA}$ 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 :-

Which of the following enzymes is used to join $DNA$ fragments?

The function of nucleases is to ........

Which one of the following is commonly used in the transfer of foreign $DNA$ into crop plants?