The organism which is used for gene transfer in higher organisms is

In genetic engineering,the reason for using restriction endonucleases is that ...

Restriction endonuclease is used in

The stickiness of the ends facilitates the action of which enzyme?

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 :-

Agarose,extracted from sea weeds,is used in which of the following?