Genetic engineering is highly advanced due to the discovery of . . . . . . .

What is the term for a molecule that carries a desired gene into a host cell for cloning?

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:

Which one of the following is indispensable in genetic engineering?

Which of the following is an incorrect pair?

The specific palindromic sequence which is recognized by $EcoRI$ is: