Which of the following is used to stain separated $DNA$ fragments so that they can be visualized?

On the basis of function,which of the following is known as bioscissors?

$A$ plasmid without a selectable marker was chosen as a vector for cloning a gene. How does this affect the experiment?

Which of the following is not a cloning vector?

Given below are two statements:
Statement $I:$
Restriction endonucleases recognise specific sequences to cut $DNA$,known as palindromic nucleotide sequences.
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:

Which enzyme is used to join foreign $DNA$ to a plasmid?