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

How many types of restriction enzymes are there?

Select the appropriate option for $Agrobacterium$ $tumefaciens$.

Restriction enzymes should not have more than one site of action in the cloning site of a vector. Comment.

Which enzyme is not used for $DNA$ isolation in animal cells?

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: