Restriction' in restriction enzyme refers to

Options

A. cleaving of phosphodiester bond in DNA by the enzyme
B. cutting of DNA at specific position only
C. prevention of the multiplication of bacteriophage in bacteria
D. all of the above

Answer

B

Explanation

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) Exonucleases: Cut DNA at the ends.
(ii) Endonucleases: Make cuts at specific positions within the DNA.
These enzymes are present in bacteria to provide a type of defence mechanism called the restriction modification system..
The system consists of two components, restriction enzyme and modification enzyme. The term .restriction. refers 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 only.