(i) Restriction enzymes and DNA These enzymes cut the helix of DNA on a specific site. So, these are also known as molecular scissors. DNA is a genetic material which is responsible to transfer genetic characters from one generation to the other.
(ii) Chitinase It is--an enzyme used to break the cell wall of fungi to release its cellular parts. Certain plants and fungus consists of a cell wall composed of chitin, which provides strength to the cell. Chitinase is used when there is a need to break this wall and allow entry of foreign DNA in plant cells.