The "molecular scissors" used in genetic engineering is

Restriction enzymes are isolated chiefly from:

Select the correct pair:

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

Which of the following is a palindromic sequence?

The first restriction endonuclease type $II$,$...A..$,was isolated by Smith,Wilcox and Kelley from $...B...$ bacterium. It was found to cut $DNA$ molecules at a particular point by recognizing a specific sequence of six base pairs,known as the $...C....$. Here $A, B$ and $C$ can be: