Identify the palindromic sequence in the following base sequences.

Which of the following restriction enzymes produces blunt ends in $DNA$?

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:

Which enzyme removes nucleotides from the ends of $DNA$?

$DNA$ probes are copied from $mRNA$ molecules with the help of:

The given figure shows the $pBR322$ plasmid. Which of the following parts encodes the proteins involved in the replication of the plasmid?