Which of the following is not true about CRISPR/Cas9 system ?
A.
The system contains a gRNA and an exo nuclease
B.
CRISPR refers to c lustered regularly interspaced short palindromic repeat
C.
A gRNA guides the endonuclease to load on a DNA target and cut it
D.
It is a part of immunity system of bacterium used to resist the foreign DNA
E.
The system contains a gRNA and an endonuclease