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

What is required for the functioning of a cloning vector $DNA$?

From which organism is the $Taq$ polymerase enzyme isolated?

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:

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

$DNA$ polymerase which is used in $PCR$ is isolated from which of the following bacteria?