(c) The restriction enzymes are
called 'molecular scissors' and are responsible for cutting DNA on specific
sites. These are not found in viruses.
They are present in bacteria to provide
a type of defense mechanism called the' restriction modification system' and
the so called system consist of two component restriction enzymes and
The first component include
restriction endonudease, which identify the introduced foreign DNA and cut it
into process. Same kind of sticky end in different individual molecule of DNA
are also produced by these molecular scissors special sequence inthe ONA recognized
by restriction endonudease is called palindromic nucleotidesequence.
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