(b) The restriction enzymes are
called' molecular scissors' and are responsible for cutting DNA. Restriction
enzymes belong to a class of enzymes called nucleases.
They are of two types
(i) Exonucisassscul DNA at the
(ii) Endonucieases Make cuts at
specific positions within the DNA.
These enzymes are present in bacteria
to provide a type of defense mechanism called the ?restriction modification
This system consist of two
components, restriction enzyme and modification enzyme,
The term 'restriction' refer to
the function of these enzyme in restricting the propagation of foreign DNA of
bacteriophage in host bacterium, i.e., cutting of DNA, at specific position
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