From where is agarose gel derived?

Genes of interest can be selected from a genomic library by using

Select the appropriate option for agarose.

Insertion of a foreign $DNA$ at $BamHI$ site in an $E. coli$ cloning vector $pBR322$ results in the loss of antibiotic resistance towards :

Which of the following transforms normal plant cells into a tumor?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: When a particular restriction enzyme cuts a strand of $DNA$,overhanging stretches or sticky ends are formed.
Reason $(R)$: Some restriction enzymes cut the strand of $DNA$ a little away from the centre of the palindromic site.
In the light of the above statements,choose the correct answer from the options given below: