In case of $BamHI$,$H$ represents

Which of the following statements are not true regarding restriction endonucleases?
$A$. They are called molecular scissors.
$B$. These are the enzymes responsible for restricting the growth of bacteriophages in $E. coli$.
$C$. They cut the $DNA$ only at the centre of the palindromic sites.
$D$. They remove nucleotides only from the ends of $DNA$ fragments.
$E$. They recognise specific palindromic base-pair sequences.
Choose the answer from the options given below:

The most thoroughly studied of the known bacteria-plant interactions is the

How many nitrogen base pairs are present in the recognition sequence of $Hind\, III$?

$A$ : During gel electrophoresis,the $DNA$ fragments move towards the anode.
$R$ : $DNA$ fragments are negatively charged molecules.

Which metals are used in a gene gun for the insertion of alien $DNA$ into a competent host?